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June 2025
  9. 1917 French Army mutinies
  12. The Russian Revolution
  13. The History of Apples (Encore)
  14. Desalination
  15. Autogyros
  16. Transuranium Elements (Encore)
  17. Frederick Douglass
  18. Blue
  19. Operation Dragoon
  20. All About Hair (Encore)
  21. The Year 1800
  22. How the Ancients Made Fire
  23. The History of Ice Hockey
  24. The History of Surgery
  25. Krakatoa (Encore)
  26. Macau
  27. Catherine the Great
  28. SONAR
  29. Alternative Forms of Space Flight (Encore)
  30. Questions and Answers: Volume 31
May 2025
  1. The History of the Hamburger
  2. The Last Days and Death of Hitler
  3. Marco Polo
  4. The Batan Death March (Encore)
  5. Bonds and the Bond Market
  6. The History of Memorial Day (Redux)
  7. The Moons of Jupiter
  8. The First and Second Banks of the United States
  9. How Much Did Rome and Sub-Saharan Africa Know About Each Other?
  10. The Channel Tunnel
  11. Salt (Encore)
  12. “Honest” Jack Sheppard
  13. Emperor Diocletian
  14. Comets
  15. Aircraft Carriers (Encore)
  16. 1775: The Start of the American Revolution
  17. The Norman Conquest
  18. Alcatraz
  19. The RMS Titanic
  20. Miyamoto Musashi (Encore)
  21. The Ancient Greek Olympics
  22. Dubrovnik
  23. The Third Amendment
  24. Seed Oils
  25. The Battle of Tours (Encore)
  26. A Journey to the Center of the Earth
  27. Triple Crowns and Grand Slams
  28. A Brief History of Australia
  29. When Exactly Did the Roman Empire Fall? (Encore)
  30. The Isles of Scilly and the 350-Year War
  31. Questions and Answers: Volume 30
April 2025
  1. The Bahamas
  2. Numbers Stations (Encore)
  3. Origins of the Internet
  4. The Battle of Vicksburg
  5. The History of Banks and Banking
  6. Calendar Reform
  7. Sherman’s March to the Sea (Encore)
  8. Sede Vacante and The Process of Papal Succession
  9. The Medici Family and Renaissance Florence
  10. The Battle of Marathon (Encore)
  11. The Triffin Dilemma and the Global Reserve Currency
  12. Biological Taxonomy and the Tree of Life
  13. The Search for Life Outside the Solar System
  14. Rare Earth Elements (Encore)
  15. The History of Wire
  16. The Occupation and Liberation of Paris
  17. Platinum, Palladium, and Rhodium: The Other Precious Metals
  18. Operation Barbarossa (Encore)
  19. All About Fiji
  20. The Ancient World Isn’t Done With Us (Live)
  21. Nobel Prize Snubs
  22. A History of Lead (Encore)
  23. The Kuiper Belt and the Oort Cloud
  24. The History of the Guitar
  25. The Reign of Terror
  26. Open Source Software
  27. The History of Pasta (Encore)
  28. Mass Extinction Events
  29. Questions and Answers: Volume 29
  30. The Crimean War
March 2025
  1. Attila the Hun (Encore)
  2. The Knuckleball
  3. The Scientific Method
  4. The Many Conquests of Sicily
  5. The History of Military Ranks (Encore)
  6. Ramage’s Rampage
  7. Hildegard of Bingen
  8. The Columbian Exchange
  9. Cruciferous Vegetables (Encore)
  10. Marcus Aurelius: Emperor and Philosopher
  11. The History of Whaling
  12. Magnetic Pole Reversal (Encore)
  13. March Madness
  14. Why Is the Alphabet in Alphabetical Order?
  15. The Battle of Gettysburg
  16. The Invention of the Telephone
  17. Betamax vs. VHS (Encore)
  18. The Cardiff Giant
  19. Lunar Eclipses
  20. Crossbows
  21. Emperor Claudius (Encore)
  22. Messier Objects
  23. Primate and Global Cities
  24. Artificial Turf
  25. Hydropower
  26. The Maginot Line (Encore)
  27. The Underground Railroad
  28. Timor-Leste (East Timor)
  29. The Academy Awards
  30. The Year 1700
  31. Questions and Answers: Volume 28
February 2025
  1. Nellie Bly (Encore)
  2. Economic Statistics
  3. Andalusia
  4. The Mexican-American War
  5. Land Reclamation: How the Dutch Made Land from the Sea
  6. The Tensho Embassy (Encore)
  7. The Greek Gods
  8. Medal of Honor
  9. The Mitford Sisters
  10. Aswan High Dam
  11. The Battle of Gaugamela
  12. Antimatter (Encore)
  13. Poker
  14. Special Forces
  15. The Saint Valentine’s Day Massacre 
  16. Spy Satellites
  17. Separated at Birth (Encore)
  18. The Falkland Islands
  19. The Trojan War (Encore)
  20. Natural Gas Explained: Past, Present, and Future
  21. The World’s Next New Countries
  22. The Cambridge Five
  23. Route 66 (Encore)
  24. The Prime Meridian
  25. Stalingrad: The Bloodiest Battle in History
  26. The Origins and History of the Abolitionist Movement
  27. How Hawaii Became a State (Encore)
  28. Questions and Answers: Volume 27
January 2025
  1. Mafia Royalty: The Five Families and Their Influence on New York
  2. The OMG! Particle (Encore)
  3. The History of Soft Drinks
  4. 444 Days: The Iran Hostage Crisis
  5. The Acoustic Kitty and Other Crazy CIA Plots
  6. The Knights Templar (Encore)
  7. VTOL: Vertical Take-Off and Landing Aircraft
  8. Malaria: The Disease That Shaped History
  9. The Maha Kumbh Mela Pilgrimage: The World’s Largest Religious Festival
  10. Performance Enhancing Drugs and Substances
  11. The Worst Day in Human History:  January 23, 1556
  12. Beijing: Exploring 3,000 Years of History
  13. Presidential Inaugurations: The Peaceful Transition of Power (Encore)
  14. Operation Market Garden (Encore)
  15. Pyotr Ilyich Tchaikovsky and the 1812 Overture (Encore)
  16. Caesar, Pompey, Crassus: The First Trimurate (Encore)
  17. Perpetual Motion (Encore)
  18. Famines
  19. The Schlitz Mistake
  20. The History of the Tomato (Encore)
  21. Gnosticism
  22. The Ultraviolet Catastrophe and the Creation of Quantum Mechanics
  23. Fractals
  24. Hosting the Olympics
  25. The Canadian Parliament
  26. The Black Death (Encore)
  27. FBI: The Federal Bureau of Investigation
  28. The Vikings
  29. Lions
  30. The Periodic Table of the Elements (Encore)
  31. Questions and Answers: Volume 26
December 2024

  1. New Year’s Traditions (Encore)
  2. Tokyo
  3. Game Shows
  4. The Siege of Tobruk
  5. The Geography of Canada
  6. Boxing Day (Encore)
  7. The Battle of Trenton
  8. The 1826 West Point Egg Nog
  9. The Plum Pudding Riots and the Puritan War on Christmas
  10. The Opium Wars (Encore)
  11. How to Build a Mars Colony
  12. The Late Bronze Age Collapse
  13. Superstitions
  14. Zone Rouge and the Iron Harvest (Encore)
  15. The Parthenon and the Acropolis of Athens
  16. Peanuts
  17. Sand
  18. Gunung Padang (Encore)
  19. Women’s Suffrage
  20. Prisoners of War and the Geneva Conventions
  21. The Korean War
  22. The Silk Road (Encore)
  23. CDs, DVDs, and Blu-Ray
  24. The Plans for a US/Canadian War
  25. The Julio-Claudian Dynasty
  26. Black Holes (Encore)
  27. The White House
  28. The Electrical Grid
  29. The War of the Roses
  30. The History of Tea (Encore)
  31. Questions and Answers: Volume 25
November 2024

  1. Representative Riffs
  2. The Tyranny of the Rocket Equation (Encore)
  3. The North American Turkey (Encore)
  4. The Islamic Caliphates
  5. Fermat’s Last Theorem
  6. Prisons and Jails
  7. The Panic of 1893 (Encore)
  8. The Election of 1788
  9. The Year 1600
  10. Multiple Births (Encore)
  11. California
  12. The History of the Bow and Arrow
  13. The Blitz
  14. Investing 101
  15. Citizenship
  16. The Magna Carta (Encore)
  17. The Nile River (Encore)
  18. The Bone Wars
  19. All About Butter
  20. Superman
  21. The Northwest Passage (Encore)
  22. The Roman Donut……LIVE!
  23. The Origin of Words and Phrases: Nautical
  24. The Battle of the Little Big Horn
  25. The Election of 1864 (Encore)
  26. Project Habakkuk
  27. The Surprising Origin of Monopoly (Encore)
  28. Squaring the Circle
  29. Questions and Answers: Volume 24
  30. The East African Rift (Encore)
October 2024
  1. Werewolves
  2. Vampires
  3. Frankenstein
  4. Mummies
  5. Zombies
  6. Uncontacted Peoples (Encore)
  7. Lizzie Borden
  8. East and West Berlin
  9. Terraforming Mars
  10. The Mongol Invasions of Japan (Encore)
  11. Conflict of the Orders: Plebeians vs Patricians
  12. The Solar Cycle
  13. Compound Interest
  14. The History of Breakfast
  15. Michelangelo (Encore)
  16. Guam And The Northern Mariana Islands
  17. What Has the JWST Discovered (So Far)?
  18. The History of Insurance (Encore)
  19. The Boxer Rebellion
  20. The Battle of the Bulge
  21. Rogue Waves
  22. The Invention of the Airplane (Encore)
  23. The Paraguayan War
  24. The Marshall Plan
  25. Bird Migrations
  26. The Origins of Playing Cards (Encore)
  27. The Crusader Sack of Constantinople
  28. Khmer Empire
  29. Oxygen (Encore)
  30. The Newspaper Wars
  31. Questions and Answers: Volume 23
September 2024
  1. Roman Roads
  2. Antarctica’s Dry Valleys (Encore)
  3. Relocated Sports Teams
  4. The Sistine Chapel (Encore)
  5. The United States Supreme Court
  6. Napoleon’s 100 Days
  7. The Godfather
  8. King Tutankhamen (Encore)
  9. The 1978 Lufthansa Heist
  10. The Grand Ethiopian Renaissance Dam
  11. Bowling
  12. What is Calculus? (Encore)
  13. Black Tuesday and the 1929 Stock Market Crash
  14. The French Origins of English
  15. Vichy France
  16. The Disappearance of Michael Rockefeller (Encore)
  17. Box Office Bombs
  18. Lake Superior
  19. Counterfeiting
  20. Imperial Units of Measure
  21. The Last Emperor of China
  22. Silbo Gomero
  23. Liberia (Encore)
  24. Permutations and Combinations (Encore)
  25. The National Park Service (Encore)
  26. The History of Pizza (Encore)
  27. The Donner Party (Encore)
  28. The Most Important Supermarket Visit in History (Encore)
  29. The Battle of The Marne (Encore)
  30. Questions and Answers: Volume 22
August 2024
  1. Dome of the Rock (Encore)
  2. Once Upon a Time in Shaolin
  3. The Prime Minister Who Was Eaten
  4. The Crisis of the Third Century
  5. Exercise Tiger
  6. Exoplanets (Encore)
  7. Mos Maiorum and Unwritten Rules
  8. The Unification of Italy
  9. A Brief History of Texas
  10. The Lighthouse of Alexandria (Encore)
  11. Supercomputers and the Evolution of Computing Power
  12. Sun Yat-sen (Encore)
  13. The Scramble for Africa
  14. The Arctic and the North Pole
  15. A History of the Circus
  16. The Silurian Hypothesis (Encore)
  17. The Origin of Words and Phrases: Food
  18. The Year 1500
  19. The Anarchy (Encore)
  20. The Origins of the Vietnam War
  21. Mary, Queen of Scots
  22. Gemstones
  23. Fingerprints (Encore)
  24. The Battle of Fort Sumter
  25. The GOATs
  26. The Manhattan Project
  27. The Berlin Wall (Encore)
  28. The History of Data Storage
  29. Questions and Answers: Volume 21
  30. Home Field Advantage
  31. Spruce Goose (Encore)
July 2024
  1. The Library of Congress
  2. The Murder of Thomas Becket (Encore)
  3. Yellowstone National Park
  4. Gamblers Who Beat the House
  5. Why Did The Roman Empire Fall?
  6. The Hubble Space Telescope
  7. Cleopatra (Encore)
  8. The History of Motion Pictures
  9. Tristan da Cunha: The World’s Most Isolated Human Settlement (Encore)
  10. A Brief History of Nothing
  11. The Geography of Mexico
  12. The Germ Theory of Disease
  13. The 1919 Chicago White Sox Scandal (Encore)
  14. Textiles, Fabrics, and Cloth
  15. The Battle of Carrhae
  16. The Himalayas
  17. The Morgenthau Plan (Encore)
  18. The Apollo 1 Disaster
  19. The Herculaneum Papyri
  20. The Passenger Pigeon (Encore)
  21. The Worst Roman Emperors (Encore)
  22. The Origin of Words and Phrases: Common Idioms
  23. Unintended Consequences
  24. The English Premier League
  25. The Horrible Voyage of the 1905 Russian Baltic Fleet (Encore)
  26. How to Lie With Statistics
  27. Questions and Answers: Volume 20
  28. The Declaration of Independence (Encore)
  29. Broadway
  30. Thorium (Encore)
  31. The Abdication of Edward VIII
June 2024
  1. The Drake Equation (Encore)
  2. The North Africa Campaign
  3. Maize aka Corn
  4. Gregor MacGregor
  5. The Discovery and Burial of the Remains of Richard III (Encore)
  6. Air Conditioning
  7. The Founding of the United Nations
  8. The Marginal Revolution (Encore)
  9. The French Foreign Legion
  10. The Domestication of Cats (Encore)
  11. The History of Skyscrapers
  12. The Moon
  13. Phillip II of Macedon
  14. Charles Ponzi and His Scheme (Encore)
  15. The Danube River
  16. The History of Toilets
  17. Wu Zetian: China’s Only Female Emperor (Encore)
  18. The US Occupation of the Philippines
  19. The Origins of Wine (Encore)
  20. The War of 1812
  21. The History of Books
  22. College Sports
  23. NINJAS! (Encore)
  24. The Five Good Emperors (Encore)
  25. D-Day
  26. The Apollo Lunar Module
  27. A Brief History of Central America
  28. The History of Money (Encore)
  29. The St. Scholastica Day Riot
  30. Questions and Answers: Volume 19
May 2024
  1. The Gulf of Tonkin Incident
  2. Cowboys
  3. The Destruction and Rediscovery of Pompeii (Encore)
  4. The Wonderful World of Bees
  5. The Law of the Sea
  6. The Batan Death March
  7. How Barbed Wire Shaped the West and the World (Encore)
  8. Joan of Arc
  9. Nazis in South America
  10. Yugoslavia
  11. The Days of the Week (Encore)
  12. Viruses
  13. The Battle of Adrianople
  14. Smuggling Silk Out of China (Encore)
  15. The Anaconda Plan
  16. City Syndromes
  17. The Phoenician Civilization (Encore)
  18. Edward Teller and the Development of the H-Bomb
  19. Abdulrahman Ibrahim Ibn Sori: 40 Years a Slave (Encore)
  20. All About Hair
  21. Kamikazes
  22. The 1956 Suez Crisis
  23. A History of Camping
  24. One Word: Plastics (Encore)
  25. Battle of Bannockburn
  26. The Plan Dog Memorandum (Encore)
  27. Canadian Football
  28. Spartacus and the Third Servile War (Encore)
  29. The Piltdown Man Hoax
  30. Questions and Answers: Volume 18
  31. Asteroids
April 2024
  1. A History of the Crusades
  2. White Feather Girls (Encore)
  3. Operation Valkyrie and the Plot to Kill Hitler (Encore)
  4. Fifty-four Forty or Fight!
  5. The Broad Street Cholera Outbreak (Encore)
  6. Qin Shi Huang: China’s First Emperor
  7. Central Park
  8. Concorde: The World’s Fastest Passenger Airplane (Encore)
  9. The Battle of the Teutoburg Forest (Encore)
  10. The Largest Known Things in the Universe
  11. The Origin of Words and Phrases: Military
  12. Batteries
  13. A Brief History of Belgium
  14. The History of Money (Encore)
  15. Great Wall of China (Encore)
  16. Sandwiches
  17. Aircraft Carriers
  18. King George III
  19. Sergeant York
  20. Ernest Shackleton and the Rescue of the Endurance (Encore)
  21. The History of Coffee (Encore)
  22. Songkran (Encore)
  23. The Telemark Raids (Encore)
  24. The Kidnapping of Charley Ross (Encore)
  25. Eclipses
  26. Questions and Answers: Volume 17
  27. Jackie Robinson
  28. The Legend of Bigfoot (Encore)
  29. Planet X
  30. The Vestal Virgins
March 2024
  1. The History of Apples
  2. The Easter Controversy (Encore)
  3. Jet Propulsion
  4. The Cult of Pythagoras (Encore)
  5. Adrian Carton de Wiart
  6. The War of the Currents (Encore)
  7. Railways
  8. Hong Kong
  9. Miyamoto Musashi
  10. The History of Rice (Encore)
  11. The History of the Bicycle (Encore)
  12. Michelin Star Restaurants
  13. Krakatoa
  14. The Grand Canyon
  15. The Election of 1860 (Encore)
  16. Stocks and Stock Exchanges
  17. Young Julius Caesar
  18. Pi Day (Encore)
  19. Homing Pigeons
  20. The History of the CIA
  21. The Domain Name System
  22. The History of Military Ranks
  23. Daylight Savings Time (Encore)
  24. The Legend of Ned Kelly (Encore)
  25. Senegal and The Gambia
  26. The Discovery of DNA
  27. The History of Postal Delivery (Encore)
  28. Napoleon Bonaparte
  29. The Little Ice Age (Encore)
  30. Questions and Answers: Volume 16
  31. The Battle of Cajamarca
February 2024
  1. Leap Year
  2. What Were The First and Second Reichs? (Encore)
  3. Stealth Technology
  4. Passports
  5. Cruciferous Vegetables
  6. The Tuskegee Airmen
  7. The 13th Amendment (Encore)
  8. Pearls
  9. Spanish-American War (Encore)
  10. The United States Presidential Nominating System
  11. Numbers Stations
  12. Conquering Mount Everest (Encore)
  13. Admiral Isoroku Yamamoto
  14. The Battle of Tours
  15. Phrenology
  16. Operation Paperclip (Encore)
  17. Transuranium Elements
  18. Marcus Antonius
  19. The Super Bowl (Redux)
  20. Apollo 13 (Encore)
  21. All About Eggs
  22. The Whiskey Rebellion
  23. The Desecration of St. Denis
  24. The Gracchi Brothers (Encore)
  25. Formal Logic
  26. The Red Baron (Encore)
  27. Questions and Answers: Volume 15
  28. Operation Barbarossa
  29. Angkor
January 2024
  1. The Geography of Spain
  2. Domestication of the Horse
  3. Prohibition
  4. Universe 25 (Encore)
  5. What is the Deal With Starship? (Redux)
  6. The James Webb Space Telescope (Redux)
  7. The Two-Hour Marathon (Redux)
  8. President Tyler’s Grandsons (Redux)
  9. The Most Dominant Athlete Ever (Redux)
  10. The Six Star General (Redux)
  11. Apollo 18, 19, and 20 (Encore)
  12. The History of Lead
  13. Emperor Nero
  14. Cahokia
  15. The Irish Potato Famine (Encore)
  16. The London Underground
  17. The History of Pasta
  18. Swiss Mercenaries (Encore)
  19. Alternative Forms of Space Flight
  20. Human Life Expectancy
  21. The Last of the Romanovs (Encore)
  22. LEDs: Light Emitting Diodes
  23. The Maginot Line
  24. Everything You Need to Know About Petroleum (Encore)
  25. Trial By Combat (Encore)
  26. Questions and Answers: Volume 14
  27. Introduction to the Philippines
  28. The Legend of Babe Ruth
  29. The Hindenburg Disaster (Encore)
  30. e: Euler’s Number
  31. Spirits and Liqueurs
December 2023
  1. Salt
  2. The Black Death
  3. The Second Triumvirate (Encore)
  4. High Fructose Corn Syrup (Encore)
  5. The Tomb of Alexander the Great (Encore)
  6. The Christmas Truce of 1914 (Encore)
  7. Why is Christmas on December 25? (Encore)
  8. Apollo 8
  9. The Santa Claus Association
  10. Snow
  11. Non-Euclidean Geometry
  12. Madrid
  13. Scurvy (Encore)
  14. The Assassination of Abraham Lincoln
  15. Encyclopedias
  16. The Acadian Expulsion (Encore)
  17. Potpourri: Incredible Coincidences
  18. Copper
  19. Alexander the Great
  20. Punctuation Marks (Encore)
  21. Cracking the Enigma Code
  22. The Quasi-War
  23. Shakespeare’s English (Encore)
  24. Hanukkah 
  25. Did the US Have Advanced Knowledge of the Attack on Pearl Harbor?
  26. The Walled City of Kowloon (Encore)
  27. The Extraordinary Life of Josephine Baker
  28. The History of Farming
  29. Questions and Answers: Volume 13
  30. The Molotov–Ribbentrop Pact (Encore)
  31. The Library of Alexandria (Encore)
November 2023
  1. Gerrymandering
  2. Uranus
  3. Ocean Currents
  4. Was King Arthur Real? (Encore)
  5. The Opium Wars
  6. French Overseas Departments
  7. The Donner Party
  8. The History of Thanksgiving (Encore)
  9. The North American Turkey
  10. Who Were the Pilgrims? (Encore)
  11. The Monroe Doctrine
  12. The Element Mercury
  13. How Roman Armies Worked
  14. The Lindbergh Kidnapping (Encore)
  15. Parachutes
  16. The 1972 World Chess Championship (Encore)
  17. The League of Nations (Encore)
  18. The History of Pizza
  19. Eponymous Laws: Part 2
  20. The OMG! Particle
  21. Constantinople (Encore)
  22. Operation Unthinkable
  23. The Colosseum (Encore)
  24. Sergei Korolev: The Most Important Russian You’ve Probably Never Heard Of
  25. A Brief History of Digital Audio
  26. Remember, Remember the 5th of November (Encore)
  27. Questions and Answers: Volume 12
  28. All About the Sun
  29. The Hanseatic League (Encore)
  30. The Origin of Words and Phrases: India
October 2023
  1. The Salem Witch Trials
  2. H.H. Holmes, America’s ‘First’ Serial Killer
  3. Halloween (Encore)
  4. What is Calculus?
  5. The Yangtze River
  6. Operation Tannenbaum (Encore)
  7. The Sultanate of Oman
  8. A Brief History of Microscopy
  9. Plutonium (Encore)
  10. How the Roman Republic Became the Roman Empire
  11. The Magna Carta
  12. The Tensho Embassy
  13. All About Sushi (Encore)
  14. Beethoven’s 9th Symphony (Encore)
  15. China’s Imperial Dynasties
  16. Zone Rouge and the Iron Harvest
  17. The Speed of Sound
  18. The Dieppe Raid (Encore)
  19. The Roman Dictatorship
  20. The World’s Oldest Things
  21. The Domestication of Dogs (Encore)
  22. The History of the Tomato
  23. The Axis Powers
  24. Antibiotics
  25. The Princes in the Tower (Encore)
  26. The Knights Templar
  27. The Disappearance of Glenn Miller
  28. The Kiel Mutiny (Encore)
  29. The Nobel Prize
  30. The Partition of India and Pakistan
  31. Questions and Answers: Volume 11
September 2023
  1. Why Didn’t Canada Join the American Revolution? (Encore)
  2. Nitrogen
  3. Examining The Zipper (Encore)
  4. The Battle of Marathon
  5. How Blockchains Work
  6. Introduction to Rocks and Minerals
  7. The History of Chocolate (Encore)
  8. Nellie Bly
  9. Maximilian I of Mexico
  10. The Battle of Milvian Bridge (Encore)
  11. Operation Market Garden
  12. Paella
  13. The Big Year
  14. Wiliam Marshall: The Greatest Knight in History (Encore)
  15. The Northwest Passage
  16. Peggy Guggenheim
  17. Delhi
  18. The Know Nothing Party
  19. Elizabeth Báthory: Aristocratic Serial Killer (Encore)
  20. The Miller–Urey Experiment (Encore)
  21. Cincinnatus (Encore)
  22. The Berlin Airlift (Encore)
  23. World War Zero (Encore)
  24. The Sahara Desert Wasn’t Always (Encore)
  25. Questions and Answers: Volume 10
  26. Infinity and Beyond (Encore)
  27. The Big Bang
  28. São Tomé and Príncipe
  29. Nostradamus (Encore)
  30. Filibusters
August 2023
  1. Barcodes (Encore)
  2. How Hawaii Became a State
  3. Multiple Births
  4. A History of Human Labor
  5. Bricks
  6. Yes, We Have No Bananas (Encore)
  7. The Disappearance of Michael Rockefeller
  8. The Most Famous Song in the World (Encore)
  9. Oxygen
  10. A History of Tattoos
  11. Antarctica’s Dry Valleys
  12. Otto Rahn: The Real-Life Indiana Jones Villain (Encore)
  13. Gladiators
  14. The Silk Road
  15. The Queen of Sheba (Encore)
  16. Antimatter
  17. The Kingdom of Tonga
  18. Project Orion
  19. Prester John (Encore)
  20. The Surprising Origin of Monopoly
  21. Pompey Magnus
  22. The Lost Civilization of Atlantis (Encore)
  23. Stalag Luft III and the Great Escape
  24. The History of Tea
  25. Route 66
  26. The WOW! Signal
  27. Questions and Answers: Volume 9
  28. Ancient Colors (Encore)
  29. Singapore
  30. Permutations and Combinations
  31. Space Elevators
July 2023
  1. Alma Maria Mahler Gropius Werfel
  2. Betamax vs. VHS
  3. Mount Fuji
  4. The Battle of Thermopylae (Encore)
  5. Soyuz 11
  6. A Brief History of Golf
  7. The Maya Civilization
  8. The Origins of Wine
  9. The Battle of Midway
  10. The Discovery of Fire (Encore)
  11. The Elevator (Encore)
  12. Why Isn’t the West Indies a Country? (Encore)
  13. The Battle of Yarmouk (Encore)
  14. The Galapagos Islands (Encore)
  15. A Brief History of London
  16. The Silurian Hypothesis
  17. Titanium
  18. The Greatest Concert in History
  19. The History of Blue Jeans (Encore)
  20. Emperor Claudius
  21. Could There Be Extraterrestrial Life In Our Solar System?
  22. The Dead Sea Scrolls
  23. Europe vs EU vs Eurozone vs Schengen Area
  24. Questions & Answers: Volume 8
  25. The Chinese Language(s)
  26. The Mother of All Demos (Encore)
  27. The Rarest Feats in Sports
  28. A History of the American Flag
  29. The Taj Mahal
  30. Khalid Ibn al-Walid: The Sword of Allah (Encore)
  31. Canada Day
June 2023
  1. The Origin of Words and Phrases: Shakespeare
  2. Last Man on the Moon (Encore)
  3. Tau
  4. Operation Fork and Iceland in WWII
  5. The Toba Eruption
  6. More Than You Ever Really Wanted to Know About Sewers (Encore)
  7. The Large Hadron Collider
  8. The Anarchy
  9. The Persian Empire(s)
  10. Lady Death: Lyudmila Pavlichenko (Encore)
  11. Dome of the Rock
  12. The Negro Leagues
  13. Father and Son Medal of Honor Winners
  14. Dadaism
  15. Invasive Species
  16. Rat Eradication on South Georgia Island (Encore)
  17. The Mongol Invasions of Japan
  18. Iron
  19. Gunung Padang
  20. Esperanto and the Search for a Global Language (Encore)
  21. Comic Books
  22. The Night the Stars Fell Down – 1833
  23. England, Britain, and the United Kingdom: What’s the Difference?
  24. Bell Labs (Encore)
  25. The Cadaver Synod
  26. Smuggling Silk Out of China
  27. The Town That Forgot It Was In The United States
  28. Questions & Answers: Volume 7
  29. The East African Rift
  30. The Fermi Paradox (Encore)
May 2023

  1. Uncontacted Peoples
  2. The History of Insurance
  3. The Lost Colony of Roanoke
  4. Why Is The Sky Blue? (Encore)
  5. Attila the Hun
  6. Tsutomu Yamaguchi: The Man Who Survived Two Atomic Bombs
  7. The Meteor That Determined the Outcome of a Battle
  8. Terra Nullius (Encore)
  9. The Solomon Islands
  10. Irrational Numbers
  11. The Origin of Words and Phrases: Sports
  12. Why Wasn’t the Wheel Invented Sooner? (Encore)
  13. Mount St. Helens
  14. Stealing the Mona Lisa (Encore)
  15. The Most Dangerous Substances in the World
  16. Moneyball and the Rise of Advanced Statistics in Sports
  17. Namibia
  18. Mother’s Day (Encore)
  19. Thorium
  20. The Domestication of Cats
  21. The Trinity Test (Encore)
  22. The Manila Galleons
  23. How Wild Was the Wild West?
  24. The International Space Station
  25. Questions & Answers: Volume 6
  26. British Coronation Traditions
  27. Cinco de Mayo
  28. How Many Countries Are There? (Encore)
  29. Separated at Birth
  30. Galaxies
  31. Lady Jane Grey
April 2023
  1. Why The Map In Your Head Is Wrong (Encore)
  2. The Pantheon
  3. Arbor Day
  4. The Tyranny of the Rocket Equation
  5. Was the Holy Roman Empire, Holy, Roman, or an Empire? (Encore)
  6. The Aral Sea
  7. ANZAC Day
  8. Venus
  9. Han van Meegeren: Forgery As an Art Form (Encore)
  10. The Origin of Words and Phrases: Volume 1
  11. The History of Coffee
  12. The Zimmerman Telegram (Encore)
  13. The Berlin Wall
  14. The Rise of Agriculture
  15. Liberia
  16. Typhoid Mary
  17. The History of Horses in North America (Encore)
  18. Songkran
  19. Oliver Cromwell
  20. Fingerprints
  21. An Introduction to the Balkans
  22. The Easter Controversy
  23. Black Holes
  24. Cleopatra
  25. Which Came First: Beer or Bread? (Encore)
  26. The Great Lakes
  27. Thor Heyerdahl and the Kon-Tiki Expedition
  28. The Five Good Emperors
  29. Episode 1000!
  30. April Fool’s Day (Encore)
March 2023

  1. World’s Most Famous Bets
  2. Fallacious Reasoning (Encore)
  3. Ramadan
  4. The October Crisis
  5. The Marginal Revolution
  6. Libraries
  7. Migration to the Americas
  8. Negative Numbers
  9. Early American Alcohol Consumption (Encore)
  10. The Origins of Baseball
  11. The 1964 Alaska Earthquake
  12. Sun Yat Sen
  13. The Amazon River
  14. Venice
  15. The Cuban Missile Crisis
  16. El Niño and La Niña (Encore)
  17. RADAR
  18. The History of Rock and Roll
  19. The National Park Service
  20. The Panama Canal
  21. Paper
  22. Houdini
  23. Chickens (Encore)
  24. The Knights of Malta
  25. The 1258 Siege of Baghdad
  26. Questions & Answers: Volume 5
  27. The Football War
  28. Out of Africa
  29. Rosie the Riveter
  30. Lysenkoism (Encore)
  31. All About Air
February 2023
  1. Perpetual Motion
  2. The Most Important Supermarket Visit in History
  3. Proscription Lists
  4. Nanotechnology
  5. The City of Paris
  6. The History of the Compass (Encore)
  7. Game Theory
  8. Space Shuttle Challenger Disaster
  9. President’s Day
  10. The Battle of The Marne
  11. Artificial Sweeteners
  12. The 27th Amendment (Encore)
  13. The Boston Massacre
  14. Magnetic Pole Reversal
  15. The Dunning-Kruger Effect
  16. The Thirty Years’ War
  17. The Super Bowl (Encore)
  18. Vitamin D
  19. Neptune
  20. The Cult of Reason
  21. Spruce Goose
  22. Wu Zetian: China’s Only Female Emperor
  23. Questions & Answers: Volume 4
  24. United States Minor Outlying Islands (Encore)
  25. 536: The Worst Year in History
  26. Teapot Dome Scandal
  27. Vanuatu
  28. All About Volcanoes
January 2023

  1. The Invention of the Airplane
  2. The Statue of Liberty
  3. The Carrington Event (Encore)
  4. Snake Oil (Encore)
  5. Tulipmania (Encore)
  6. The Purchase of Alaska (Encore)
  7. The Lykov Family (Encore)
  8. Ancient Rome and Ancient China (Encore)
  9. The Battle of Yorktown
  10. The Speed of Light
  11. The Passenger Pigeon
  12. The Glorious Revolution
  13. The Port Chicago Disaster (Encore)
  14. Sherman’s March to the Sea
  15. The History of Basketball
  16. Leprosy: Humanity’s Oldest Disease
  17. Tokyo Rose & Axis Sally (Encore)
  18. Zeno’s Paradoxes
  19. Tristan da Cunha: The World’s Most Isolated Human Settlement
  20. What Were The First and Second Reichs?
  21. The Destruction and Rediscovery of Pompeii
  22. Limnic Eruptions: The Rarest Natural Disaster
  23. The Morgenthau Plan
  24. The Antikythera Mechanism (Encore)
  25. Carbon: Can’t Live Without It
  26. Questions & Answers: Volume 3
  27. The Speaker of the House of Representatives
  28. The Trojan War
  29. The Zone of Death
  30. Why Are There No Flying Cars?
  31. New Year’s Traditions
December 2022
  1. Why Does the Year Start on January 1? (Encore)
  2. The Sight and Sound Decadal Survey
  3. The Dead Sea (Encore)
  4. Abram Petrovich Gannibal
  5. The Little Ice Age
  6. Boxing Day
  7. The Christmas Truce of 1914
  8. Christmas Foods
  9. Christmas Carols
  10. The Winter Solstice
  11. Mount Athos (Encore)
  12. NASA’s Human Computers
  13. The Tombs of the Unknown Soldiers
  14. Isaac Newton: The World’s Most Famous Alchemist
  15. The Reconquista
  16. Salvator Mundi (Encore)
  17. Operation Valkyrie and the Plot to Kill Hitler
  18. Apollo 13
  19. The Walled City of Kowloon
  20. Paricutin: The World’s Youngest Volcano
  21. The Pipe Organ
  22. The Island of Saint Helena (Encore)
  23. The Roman Triumph
  24. Hi Ho Silver!
  25. The Most Important Battles in History
  26. Questions & Answers: Volume 2
  27. The Domestication of Dogs
  28. The History of Credit Cards (Encore)
  29. The Dumbest Game Every Played
  30. The Red Baron
  31. The Space Shuttle
November 2022
  1. Countries That Changed Their Name
  2. Prime Numbers (Encore)
  3. Geography is Destiny
  4. Weather Forecasting
  5. The Basques
  6. Black Friday (Encore)
  7. Who Were the Pilgrims? (Encore)
  8. The History of Thanksgiving (Encore)
  9. Ummm…..Okay
  10. The Greatest Buildings Never Built
  11. The FIFA World Cup
  12. The Gracchi Brothers
  13. The Triangle Shirtwaist Factory Fire (Encore)
  14. Leap Seconds
  15. The Dieppe Raid
  16. World Population Throughout History
  17. The Lighthouse of Alexandria
  18. The Last of the Romanovs
  19. Why Is the Sky Blue?
  20. The Isle of Man
  21. The Peace of Westphalia (Encore)
  22. A History of Midterm Elections
  23. Punctuation Marks
  24. When Exactly Did the Roman Empire Fall?
  25. Questions & Answers: Volume 1
  26. British Currency Decimilisation
  27. Horses in World War II
  28. Alfred Wegener and Continental Drift (Encore)
  29. Banned Techniques That Would Smash World Records in Track and Field
  30. The Presidential Line of Succession
October 2022
  1. The Panic of 1893
  2. Vinland, Vikings, and Lactose Intolerance (Encore)
  3. Philip II of Spain
  4. The Maldives
  5. Operation Felix
  6. The History of Recorded Sound
  7. The 13th Amendment
  8. Cricket for Dummies…..and Americans
  9. The Battle of Milvian Bridge
  10. Wind Power
  11. The Nubian Civilization and the Kingdom of Kush
  12. The Year Without A Summer (Encore)
  13. Vitamins
  14. Castle Engineering 101
  15. SETI: The Search for Extraterrestrial Intelligence
  16. The Broad Street Cholera Outbreak
  17. Rapa Nui (Easter Island)
  18. High Fructose Corn Syrup
  19. The Vasa (Encore)
  20. The Horrible Voyage of the 1905 Russian Baltic Fleet
  21. The Electromagnetic Spectrum
  22. The League of Nations
  23. The Kidnapping of Charley Ross
  24. Trial By Combat
  25. The History of Department Stores
  26. Airport Codes (Encore)
  27. How Barbed Wire Shaped the West and the World
  28. Broken Arrows: When Nuclear Weapons Go Wrong
  29. The Days of the Week
  30. Hurricanes and Typhoons
  31. Joseph Bonaparte: The King of New Jersey (Encore)
Septemeber 2022
  1. NINJAS!
  2. Ada Lovelace: The World’s First Computer Programmer
  3. Getting to the Bottom of Shoes
  4. The Discovery and Burial of the Remains of Richard III
  5. The Stanford Prison Experiment
  6. Astronomical Distances and the Age of the Universe
  7. Philippe Petit and the World’s Greatest Tightrope Walk (Encore)
  8. The Hindenburg Disaster
  9. Shakespeare’s English
  10. The Doolittle Raid
  11. The Channel Islands of Jersey and Guernsey
  12. The History of Chocolate
  13. How the US Congress Came To Be
  14. Carthago Delenda Est: The Third Punic War
  15. The Babbage Analytical Engine (Encore)
  16. The Wonderful World of Tin
  17. The Berlin Airlift
  18. All About Sushi
  19. The Telemark Raids
  20. The Legend of Bigfoot
  21. Didius Julianus: The Man Who Bought An Empire (Encore)
  22. The Transition from Elizabeth II to Charles III
  23. The Hollywood Sign
  24. The Very Strange Life of Ida Wood
  25. Ranked Choice Voting
  26. Wiliam Marshall: The Greatest Knight in History
  27. All About LASERS
  28. The Second Triumvirate
  29. The Judgement of Paris
  30. The Zodiac
August 2022
  1. The History of Postal Delivery
  2. Was King Arthur Real?
  3. The Artemis Program
  4. The River Congo
  5. The Louvre: The World’s Greatest Museum (Encore)
  6. The Schlieffen Plan (Encore)
  7. What Ever Happened to Amelia Earhart? (Encore)
  8. The History of Mathematical Symbols (Encore)
  9. J. Harlen Bretz: Proving Theories Via Outliving Your Critics (Encore)
  10. Luxembourg
  11. Gemini 3 and The World’s Most Controversial Corned Beef Sandwich
  12. The Legend of Jim Thorpe
  13. Spanish-American War
  14. Michaelangelo
  15. The Pan-American Highway
  16. The Origins of Playing Cards
  17. The History of NASA
  18. Formula One
  19. Innumeracy
  20. Lithium
  21. The Siege of Masada
  22. Gunfight at the OK Corral
  23. The Aurochs: The Once and Future King of Cattle
  24. White Feather Girls
  25. Did Vermeer Use A Camera Obscura? (Encore)
  26. Everything Is Made of Atoms
  27. Champagne
  28. “Let Them Eat Cake”
  29. The Republic of the Marshall Islands
  30. The Strait of Malacca
  31. The Sinking of the Bismarck
July 2022
  1. Mandarins and the Chinese Imperial Exams (Encore)
  2. The Cannonball Run
  3. The Planet Saturn
  4. Why Didn’t Canada Join the American Revolution?
  5. The Gettysburg Address
  6. Livia Drusilla: The Most Powerful Woman in Rome
  7. Communications Satellites
  8. Great Zimbabwe (Encore)
  9. The Boeing 747
  10. Hyman Rickover and the Nuclear Navy
  11. The History of the Compass
  12. The Tragic Flight of Vladimir Komarov and Soyuz 1
  13. The Past, Present, and Future of Coal
  14. The Colosseum
  15. The Murder of Thomas Becket
  16. The Travels of Ibn Battuta (Encore)
  17. Greenland
  18. Bonnie and Clyde
  19. Mata Hari
  20. Imaginary Numbers
  21. The Worst Roman Emperors
  22. The History of Cheese (Encore)
  23. The Origins of American Football
  24. The French Republican Calendar
  25. The Phoenician Civilization
  26. The Wreck of the Mary Rose
  27. The Mississippi River
  28. The Declaration of Independence
  29. The Tour de France
  30. Exoplanets
  31. Two-Year Anniversary Show
June 2022
  1. Diamonds Are Forever
  2. The Galapagos Islands
  3. Constantinople
  4. The Nuremberg Personality Tests
  5. Geothermal Energy
  6. How Accounting Changed The World (Encore)
  7. Noble Gases
  8. Universe 25
  9. Never Give Up, Never Surrender
  10. Morse Code
  11. Life in Ancient Rome
  12. Juneteenth
  13. The History of Horses in North America
  14. The Atacama Desert
  15. TORNADOES!
  16. Precision Munitions
  17. The Legend of Ned Kelly
  18. Olive Oil
  19. The Steam Engine
  20. Navajo Code Talkers (Encore)
  21. The Battle of the Teutoburg Forest
  22. Kiribati
  23. The History of Television
  24. The Nepalese Royal Massacre
  25. The Empire State Building
  26. Why The Map In Your Head Is Wrong
  27. Terra Nullius
  28. The Cult of Pythagoras
  29. The Wallace Line
  30. Yes, We Have No Bananas
May 2022
  1. Jupiter: The Solar System’s Largest Planet
  2. NATO: The North Atlantic Treaty Organization
  3. Great Dying of the Americas
  4. Did We Already Find Life On Mars? (Encore)
  5. The Queen of Sheba
  6. The First Triumvirate
  7. IQ: Intelligence Quotient
  8. A Brief History of the Mongol Empire
  9. Correlation vs Causation
  10. The Thirty Mile Zone (Encore)
  11. Was the Holy Roman Empire Holy, Roman, or an Empire?
  12. The History of Rice
  13. Lysenkoism
  14. The Petrodollar
  15. How Worried Should We Be About Asteroids?
  16. Saint Peter’s Basilica
  17. Pitcairn Island (Encore)
  18. The Library of Alexandria
  19. Friday the 13th
  20. King Tutankhamen
  21. The Vice President of the United States
  22. The Irish Potato Famine
  23. Nine Kings, One Room
  24. Mother’s Day (Encore)
  25. Bretton Woods
  26. All About Solar Power
  27. The 1919 Chicago Black Sox Scandal
  28. A Star is Born
  29. A History of the End of the World
  30. Charles Ponzi and His Scheme
  31. Samoa: The Cradle of Polynesia
April 2022
  1. Stanislav Petrov: The Man Who Saved the World (Encore)
  2. The 1812 Overture
  3. The History of BBQ
  4. All About Algorithms
  5. Elizabeth Báthory: Aristocratic Serial Killer
  6. The Gold Standard
  7. The Iffland Ring
  8. The Rise, Fall, and Possible Rise of the Wooly Mammoth
  9. The History of Photography
  10. Apollo 18, 19, and 20
  11. Ice Ages
  12. The Real-Life Lord of the Flies
  13. Chickens
  14. Righties vs Lefties (Encore)
  15. The History of Money
  16. The Hanseatic League
  17. Cryptography
  18. The Election of 1864
  19. Han van Meegeren: Forgery As an Art Form
  20. Buffalo Soldiers
  21. One Word: Plastics
  22. The Republic of Letters
  23. Esperanto and the Search for a Global Language
  24. The Catiline Conspiracy
  25. The Battle of Yarmouk
  26. Philippe Petit and the World’s Greatest Tightrope Walk
  27. Pedestrianism
  28. Behold! The Potato (Encore)
  29. White Elephants
  30. The Brachistochrone Problem
March 2022
  1. The History of Gunpowder
  2. The Unlikely Survival of Phineas Gage (Encore)
  3. The British Peerage and Honors System
  4. The Istanbul Canal
  5. The Roman Pomerium
  6. Stephanie St. Clair
  7. The History of the Tank
  8. The Eradication of Diseases
  9. Ernest Shackleton and the Rescue of the Endurance
  10. All About Hydrogen
  11. The Rite of Spring Riot
  12. The Last Soldier to Die in World War I (Encore)
  13. The Mother of All Demos
  14. The Pueblo Incident
  15. Abdulrahman Ibrahim Ibn Sori: 40 Years a Slave
  16. The Fall of Constantinople (Encore)
  17. The Ides of March
  18. Pi Day
  19. The Three Age System: Stone, Bronze, and Iron
  20. Otto Rahn: The Real Life Indiana Jones Villain
  21. Were the Dark Ages Really That Dark? (Encore)
  22. Holodomor
  23. Everything You Need to Know About Petroleum
  24. The Great Nottingham Cheese Riot of 1766
  25. Why Wasn’t the Wheel Invented Sooner?
  26. Tuvalu: The Least Visited Country in the World (Encore)
  27. The Plan Dog Memorandum
  28. Confusing Country Names
  29. Conquering Mount Everest
  30. Simo Häyhä: The White Death
  31. Mardi Gras
February 2022
  1. Peace of Westphalia
  2. The Voyages of Admiral Zheng He (Encore)
  3. Joseph Bonaparte: The King of New Jersey
  4. Roman Naming Conventions
  5. The Trinity Test
  6. The Lindbergh Kidnapping
  7. How SCUBA Diving Works
  8. The Kiel Mutiny
  9. The Nazi Bomb (Encore)
  10. Great Zimbabwe
  11. What is the Deal With Starship?
  12. Spartacus and the Third Servile War
  13. More Than You Ever Really Wanted to Know About Sewers
  14. The Wonderful World of Stromatolites
  15. Valentines Day (Encore)
  16. Kennewick Man
  17. Swiss Mercenaries
  18. How Göbekli Tepe Changed History (Encore)
  19. How Tides Work
  20. The Travels of Ibn Battuta
  21. A Brief History of New York City
  22. Scandals ending with -gate
  23. The Birth of the Modern Olympic Games (Encore)
  24. The Babbage Analytical Engine
  25. The History of the Submarine
  26. The Dyatlov Pass Incident
  27. Why Isn’t the West Indies a Country?
  28. The Spice Trade
January 2022
  1. The Mukden Incident
  2. A History of Utensils
  3. The Nile River
  4. Ramanujan (Encore)
  5. Genie the Feral Child (Encore)
  6. The American Whig Party (Encore)
  7. Operation Long Jump
  8. The Tomb of Alexander the Great
  9. The History of Cheese
  10. The 2022 Hunga Tonga–Hunga Ha’apai Eruption
  11. Didius Julianus
  12. Dresden Green Vault Burglary
  13. Ignaz Semmelweis (Encore)
  14. The Antikythera Mechanism
  15. Sports Curses
  16. Prime Numbers
  17. Mandarins and the Chinese Imperial Exams
  18. The Trust Territory of the Pacific Islands
  19. Rare Earth Elements
  20. The Acadian Expulsion
  21. The History of the Bicycle
  22. The Marian Reforms
  23. Olga of Kiev: The Patron Saint of Vengeance
  24. The Ark of the Covenant
  25. The Meiji Restoration
  26. The History of the Piano
  27. Did Vermeer Use A Camera Obscura?
  28. Great Wall of China
  29. World War Zero
  30. The History of the Eiffel Tower (Encore)
  31. Why Does the Year Start on January 1? (Encore)
December 2021
  1. Did Gutenburg Really Invent the Printing Press? (Encore)
  2. The Halifax Explosion (Encore)
  3. Mad Jack Churchill (Encore)
  4. The Incredible Polgar Sisters (Encore)
  5. Why Does Liechtenstein Even Exist? (Encore)
  6. The Immortal Henrietta Lacks (Encore)
  7. So What Exactly Are Frankincense and Myrrh
  8. Why is Christmas on December 25? (Encore)
  9. The History of Santa Claus
  10. The World’s Strangest Christmas Traditions
  11. The Highly Improbable Flight of Mathias Rust
  12. The James Webb Space Telescope
  13. Why You Can’t Resign From the British Parliament (Encore)
  14. Tsunamis
  15. The Triangle Shirtwaist Factory Fire
  16. All About Chess
  17. Moon Rocks
  18. The History of World Fairs
  19. The Wives of Henry VIII
  20. The Mount Tambora Eruption (Encore)
  21. A Human History of Ice
  22. Plutonium
  23. How Accounting Changed The World
  24. December 8, 1941
  25. The Rise and Dramatic Fall of Sejanus (Encore)
  26. Saint Nicholas
  27. Pope Joan
  28. The Internal Combustion Engine
  29. Olympic Boondoggles
  30. Banana Republics
  31. The Vasa
November 2021
  1. Planet 9
  2. The Sistine Chapel
  3. The Mechanical Turk
  4. The Sahara Desert Wasn’t Always
  5. Black Friday
  6. The History of Thanksgiving (Encore)
  7. Who Were the Pilgrims?
  8. Pitcairn Island
  9. Everything You Wanted to Know About Seawater
  10. Vinland, Vikings, and Lactose Intolerance
  11. The Cola Wars
  12. The Culper Ring
  13. Episode 500!
  14. Inflation
  15. Operation Paperclip
  16. Gold! Gold! Gold!
  17. The Battle of Alesia (Encore)
  18. Superconductivity
  19. The Fall of Constantinople
  20. The Treaty of Versailles
  21. Shibboleths
  22. Suez Canal
  23. Tokyo Rose & Axis Sally
  24. Paradoxes
  25. Skunkworks
  26. Remember, Remember the 5th of November
  27. The Election of 1860
  28. Giving the Finger to the Denisovans
  29. Lyudmila Pavlichenko
  30. Benedict Arnold
October 2021
  1. The Real Dracula
  2. Halloween (Encore)
  3. How Casinos Work
  4. Ambergris: The World’s Most Valuable Smelly Substance
  5. Monarchies vs Republics
  6. The Louvre: The World’s Greatest Museum
  7. Wedding Traditions
  8. United States Minor Outlying Islands
  9. The 1972 Olympic Basketball Final
  10. The Great Hanoi Rat Massacre of 1902
  11. Why Does Monaco Even Exist?
  12. Navajo Code Talkers
  13. How LIGO Works
  14. El Niño and La Niña
  15. The Lost Civilization of Atlantis
  16. The Brooklyn Bridge
  17. Decimation (Encore)
  18. Moore’s Law
  19. Stanislav Petrov: The Man Who Saved the World
  20. Nostradamus
  21. USS Constitution
  22. The Dancing Plague of 1518
  23. Which Came First: Beer or Bread?
  24. Did Shakespeare Write the Works of Shakespeare? (Encore)
  25. Mountweazles (Encore)
  26. The Legend of Andre the Giant (Encore)
  27. The Canary Islands (Encore)
  28. Longitude (Encore)
  29. The Four Great Inventions of Ancient China
  30. The Korean Demilitarized Zone (DMZ)
  31. The Greatest Thing Since Sliced Bread (Encore)
September 2021
  1. Year One
  2. The Nazi Bomb
  3. Alexandria
  4. Survivor Bias
  5. The Molotov–Ribbentrop Pact
  6. Righties vs Lefties
  7. Polynesian Navigators (Encore)
  8. The Great Pyramid of Giza
  9. The War of the Currents
  10. The 1961 US Figure Skating Team
  11. Alfred Wegener and Continental Drift
  12. The Truth About Pirates
  13. The Assassination of James A. Garfield (Encore)
  14. Treachery of the Long Knives
  15. Cosmic Rays
  16. The Port Chicago Disaster
  17. How Göbekli Tepe Changed History
  18. Fusion Power
  19. The Island of Saint Helena
  20. The New York World Trade Center
  21. The Unlikely Survival of Phineas Gage
  22. Atomic Bombs and Two-Piece Swimsuits (Encore)
  23. The Geologic Timeline
  24. The Ride of Sybil Ludington
  25. Air Force One
  26. The Carrington Event
  27. The Fermi Paradox
  28. The Oxford English Dictionary (Encore)
  29. Behold! The Potato
  30. The Elgin Marbles
    August 2021
    1. Ignaz Semmelweis
    2. The Planet Mercury
    3. The Golden Gate Bridge
    4. The Year Without A Summer
    5. The Number of the Beast
    6. Domo Arigato Mr. Momofuku (Encore)
    7. Starfish Prime
    8. The Schlieffen Plan
    9. The Dead Sea
    10. Black Tot Day
    11. The Civic Crown
    12. Fritz Haber: The Best and Worst Chemist in History
    13. The Golden Record (Encore)
    14. The History of Credit Cards
    15. The USS Indianapolis
    16. Snake Oil
    17. History of the Lullaby
    18. The Aberfan Disaster
    19. The Great Molasses Flood (Encore)
    20. Electric Cars
    21. Salvator Mundi
    22. The Other Mozart
    23. Tokyo 2020 Olympics: Medal and Record Recap
    24. Queen Boudica
    25. The Monty Hall Problem (Encore)
    26. The 27th Amendment
    27. The American Whig Party
    28. How Do Satellites Work?
    29. The Great Lisbon Earthquake of 1755
    30. The Periodic Table of the Elements
    31. Who Was the Greatest Olympian of All Time?
    July 2021
    1. Robert Smalls: Man of Action (Encore)
    2. The Korean Axe Murder Incident
    3. Cincinnatus
    4. Were the Dark Ages Really That Dark?
    5. Timothy Dexter: Sometimes It’s Better To Be Lucky
    6. The Children of Nazis
    7. All About Uranium
    8. The Last Germans to Surrender (Encore)
    9. The Modern Olympic Games
    10. The 1972 World Chess Championship
    11. Barcodes
    12. The Miller–Urey Experiment
    13. The Erfurt Latrine Disaster (Encore)
    14. The Last Soldier to Die in World War I
    15. The Kingdom of the Netherlands
    16. The Great Emu War
    17. Infinity and Beyond
    18. The Eiffel Tower
    19. Objects of State: United States Edition
    20. The Sibylline Books
    21. Global Temperature Extremes
    22. Supernovas: They’re a Blast!
    23. Concorde: The World’s Fastest Passenger Airplane
    24. Was Jeanne Calment Really The World’s Oldest Person?
    25. Khalid Ibn al-Walid: The Sword of Allah
    26. The Hagia Sophia (Encore)
    27. What Ever Happened to Amelia Earhart?
    28. The District of Columbia
    29. 10 Ways You Can Know That the Earth is a Sphere
    30. Prester John
    31. One-Year Anniversary Show
    June 2021
    1. Milankovitch Cycles (Encore)
    2. Tuvalu: The Least Visited Country in the World
    3. The History of Blue Jeans
    4. Did We Already Find Life On Mars?
    5. The Lost City of Cecil B. DeMille
    6. Absolute Zero
    7. The World’s Most Expensive Things
    8. The Assassination of President William McKinley
    9. A History of Computer Games
    10. The Voyages of Admiral Zheng He
    11. The Tunguska Event (Encore)
    12. How and What Do Astronauts Eat in Space?
    13. The World’s Greatest (Worst?) Misers
    14. The Rise and Dramatic Fall of Sejanus
    15. Gibraltar: Why Part of the UK is in the Mediterranean
    16. The History of the Microwave Oven
    17. Post-WWII German Expulsions
    18. The Drake Equation
    19. Sacco and Vanzetti
    20. The Six Political Eras In American History
    21. Apollo–Soyuz: The End of the Space Race
    22. How Clarence Birdseye Created the Frozen Food Aisle
    23. Why Don’t We All Drive On The Same Side of the Road? (Encore)
    24. Isambard Kingdom Brunel (Encore)
    25. The Incredible Polgar Sisters
    26. Beethoven’s 9th Symphony
    27. Why You Can’t Resign From the British Parliament
    28. Academic Degrees
    29. The St. Nazaire Raid
    30. Gaius Appuleius Diocles – The Richest Athlete in History
    May 2021
    1. The History of Memorial Day
    2. Why Does Liechtenstein Even Exist?
    3. The History of Mathematical Symbols
    4. The Battle of Alesia
    5. Potemkin Villages
    6. Bell Labs
    7. The 17-Year Cicada
    8. Tarrare: The Hungriest Man in History
    9. The Mercator Projection (Encore)
    10. Really Expensive Musical Instruments
    11. Scurvy
    12. The 2013 America’s Cup: The Greatest Comeback in Sport’s History
    13. Citizen Kane: The Greatest Movie Ever Made?
    14. Airport Codes
    15. Potpourri: Spain Edition
    16. The British Crown Jewels
    17. The Immortal Henrietta Lacks
    18. Examining The Zipper
    19. Randomness
    20. The Largest City in the World
    21. The South Atlantic Anomaly
    22. Juan Sebastián Elcano
    23. Mother’s Day
    24. The USS William D. Porter: The Unluckiest Ship in WWII
    25. The International Red Cross and Red Crescent
    26. EGOT
    27. The Leaning Tower of Pisa
    28. Genie the Feral Child
    29. Queen Isabella
    30. The Battle of Thermopylae
    31. May Day
    April 2021
    1. The Mount Tambora Eruption
    2. J. Harlen Bretz: Proving Theories Via Outliving Your Critics
    3. Mad Jack Churchill
    4. The Speech Richard Nixon Never Gave (Encore)
    5. Salvador Dali
    6. DEFCON
    7. Hanns Scharff: Master Interrogator of the Luftwaffe
    8. Longitude
    9. The Tallest Structures in History
    10. The Thirty Mile Zone
    11. The Halifax Explosion
    12. The World’s Oldest Restaurant
    13. Lingua Latina
    14. Who Was the 5th Beatle?
    15. The Dodo Bird
    16. Early American Alcohol Consumption
    17. Elizabeth Swaney and the Power of Just Showing Up
    18. Ancient Colors
    19. Non-Spanish Languages of Spain
    20. Charles Boycott
    21. Wrestlemania
    22. The Assassination of James A. Garfield
    23. Why Does Vatican City Exist?
    24. Polynesian Navigators
    25. The United State’s Name
    26. Al Andalus
    27. The Podcast About Podcasts
    28. The Incomparable Hedy Lamarr
    29. Why Did Hitler Declare War on the United States?
    30. April Fool’s Day
    March 2021
    1. Mount Athos
    2. The History of the English Language
    3. Spanish Africa
    4. The Red Ball Express
    5. Fantasy Nobel Prizes: Isaac Newton
    6. The 7 People Who Control the Internet
    7. The Problem With Track & Field World Records
    8. Did Shakespeare Write the Works of Shakespeare?
    9. Rome: Republic vs Empire
    10. La Liga
    11. The Svalbard Global Seed Vault
    12. Understanding Orchestras
    13. The B-52 Stratofortress
    14. The Yellow Fleet
    15. St. Patrick’s Day
    16. Unratified Amendments
    17. El Gordo
    18. Daylight Savings Time
    19. How the US Civil War Really Ended
    20. How Australia Won Its First Winter Olympic Gold Medal
    21. Why Does San Marino Even Exist?
    22. A History of Vaccines
    23. The Isabella Stewart Gardner Museum Heist
    24. The Mercury 13
    25. The Iditarod
    26. Operation Sea Lion
    27. Darwin’s Other Theory
    28. President for a Day
    29. The Deep Biosphere
    30. Zeppelins
    31. The War of Jenkin’s Ear
    February 2021
    1. The Princes in the Tower
    2. The Zimmerman Telegram
    3. Cathedrals
    4. Mountweazles
    5. A History of Mars Exploration
    6. The London Beer Flood
    7. Units of Measure
    8. Mitochondrial Eve
    9. The Elevator
    10. Space Junk
    11. Who Was the Richest Person in History? (Encore)
    12. Why are French Fries called French Fries? (Encore)
    13. Why Doesn’t the US Use The Metric System? (Encore)
    14. Decimation
    15. The Theremin
    16. Valentines Day
    17. Domus Aurea
    18. The SS Politician
    19. Hammurabi’s Code
    20. The Monty Hall Problem
    21. The Legend of Andre the Giant
    22. Jack the Ripper
    23. The Super Bowl
    24. AM/FM
    25. Tulipmania
    26. The Smallest Country in the World
    27. The 1937 Soviet Census
    28. Extraterritoriality

    January 2021
    1. The Dionne Quintuplets
    2. Operation Plumbbob
    3. QWERTY
    4. The Green Bay Packers
    5. Cosmos 954
    6. Milankovitch Cycles
    7. Project MKUltra
    8. The Year of the Five Emperors
    9. The Year of the Four Emperors
    10. The Oxford English Dictionary
    11. Exclaves and Enclaves
    12. Inauguration Day
    13. The Crash at Crush
    14. ALL RATS MUST DIE!!!
    15. The British Pound(s)
    16. Moving Day in New York
    17. Did Gutenburg Really Invent the Printing Press?
    18. The Dunbar Number
    19. D.B. Cooper
    20. Surströmming
    21. Hispania
    22. The Nuclear Football
    23. The McRib
    24. The Erfurt Latrine Disaster
    25. The Golden Record
    26. The Last Germans to Surrender
    27. The 12 Days of Christmas
    28. The Canary Islands
    29. Reginaldus
    30. The SS Warrimoo
    31. Why Does The New Year Start on January 1?
    December 2020
    1. Nijmegen: The City That Remembers (Encore)
    2. The Election of 1824 (Encore)
    3. The Most Famous Song in the World (Encore)
    4. Kayfabe (Encore)
    5. The Six Star General (Encore)
    6. Atlantropa: The Most Ridiculous Idea Ever (Encore)
    7. The Last Crow War Chief (Encore)
    8. The Most Dominant Athlete Ever (Encore)
    9. The Empire that Never Existed (Encore)
    10. Why Do We Celebrate Christmas on December 25?
    11. Catalonian Christmas Traditions
    12. Why Don’t We All Drive on the Same Side?
    13. What’s the Deal With Dark Matter?
    14. The Speech Richard Nixon Never Gave
    15. The Rosetta Stone
    16. Atomic Bombs and Two-Piece Swimsuits
    17. All About ZIP Codes
    18. The World’s Oldest Democratic Body
    19. The Terrible Fate of Blanche Monnier
    20. Aluminum
    21. Radiometric Dating
    22. The Man Who Didn’t Want to be Pope
    23. Roman Concrete
    24. The Mercator Projection
    25. Picasso
    26. The Real Illuminati
    27. The Voynich Manuscript
    28. How Many Nobel Prizes Should Einstein Have Won?
    29. Syndrome K
    30. Martha Mitchell Was Right
    31. Radiation 101
    November 2020
    1. Spanish Foods
    2. Battle of Cannae
    3. The House of David
    4. Operation Tannenbaum
    5. Get the Lead Out
    6. George Eyser
    7. The History of Thanksgiving
    8. The Holy Grail
    9. America’s First Law
    10. The World’s Largest Co-Principality
    11. Operation London Bridge
    12. UNESCO World Heritage Sites
    13. The Pintupi Nine
    14. The Election of 1800
    15. Spanish Festivals
    16. Jury Duty
    17. The Longest Games in History
    18. The Sultana Steamboat Disaster
    19. Blues vs Greens
    20. The Assassination of Arch Duke Franz Ferdinand
    21. Really Big Telescopes
    22. The Sagrada Familia
    23. Ramanujan
    24. A History of Bread
    25. The Pig War
    26. What Exactly Happens After Election Day?
    27. Extremely Close Elections
    28. Who Was the Richest Person in History?
    29. The Camino de Santiago
    30. The Great Molasses Flood
    October 2020
    1. Halloween
    2. Last Man on the Moon
    3. The History of Antarctica
    4. Domo Arigato Mr. Momofuku
    5. The World’s Deepest Hole
    6. The Continents
    7. Outlawry
    8. Tsar Bomba
    9. Extremely Long Term Debt
    10. The History of Presidential Debates
    11. Pyrrhic Victory
    12. The Election of 1876
    13. The Purchase of Alaska
    14. Operation Mincemeat
    15. The Curious Case of Kaspar Hauser
    16. The History of Ketchup
    17. Number One at Being Number Two
    18. Episode 100
    19. The Earth’s Most Extreme Places
    20. The SR-71 Blackbird
    21. Take the Penny, Leave the Penny
    22. That Time the CIA Kidnapped a Soviet Lunar Lander
    23. The Fabian Strategy
    24. Containerization
    25. Who is the Current Roman Emperor?
    26. Cold Fusion
    27. Wrestling’s GOAT: Aleksandr Karelin
    28. Károly Takács: Ambidextrous Gold Medalist
    29. The Eradication of Smallpox
    30. The Tunguska Event
    31. The Hagia Sophia

    September 2020
    1. The Electoral College
    2. Robert Smalls: Man of Action
    3. US Territories
    4. Greek Fire
    5. Isambard Kingdom Brunel
    6. Point Nemo
    7. Potpourri Vol II: The Frozen Four
    8. The Global Positioning System
    9. All Roads Lead to Rome
    10. The Lykov Family
    11. Nijmegen: The City That Remembers
    12. The Discovery of Fire
    13. No Show
    14. No Show
    15. No Show
    16. No Show
    17. No Show
    18. No Show
    19. Potpourri Volume I: Survival
    20. A Fist Full of Dollars
    21. Who Discovered Calculus?
    22. Fallacious Reasoning
    23. The Fosbury Flop
    24. An Incredibly Bright Idea
    25. The Two-Hour Marathon
    26. The First Transatlantic Cable
    27. The Election of 1824
    28. The Seven Wonders of the Ancient World
    29. That New Pope Smell
    30. The World’s Oldest Satellite
    August 2020
    1. A Brief History of Timekeeping
    2. The First Pandemic
    3. Eponymous Laws
    4. Football, Soccer, and Rugby
    5. The Latin Alphabet
    6. Why are French Fries called French Fries?
    7. The Last US Civil War Pension
    8. The Most Famous Song in the World
    9. The US/Canadian Border
    10. The English Longbow
    11. The Man Who Fed the World
    12. Why Doesn’t the US Use the Metric System?
    13. Cursus Honorum
    14. European vs North American Sports
    15. Lis Hartel: A Remarkable Olympian
    16. The United Countries of America
    17. Church of the Holy Sepulchre
    18. The Real Life Dexter
    19. Damnatio Memoriae
    20. The Washington Generals
    21. Kayfabe
    22. Drug Lord Hippopotamuses
    23. Grandmother of Europe
    24. Boxing’s Alphabet Soup
    25. Lunar Orbit Rendezvous
    26. The Original Dow Jones Companies
    27. Lloyd Burke: American Badass
    28. The Great Peshtigo Fire
    29. British Imperial Leftovers
    30. Van Halen and M&Ms
    31. The Pitch Drop Experiment

    July 2020
    1. Beamonesque
    2. The French Scrabble Champion
    3. The Interstate Highway System
    4. How Many Planets Are There?
    5. The Prime Minister Who Disappeared
    6. The Julian and Gregorian Calendars
    7. Atlantropa: The Most Ridiculous Idea Ever
    8. When did Canada REALLY become independent?
    9. Neil Armstrong’s First Time in Space
    10. Blowouts
    11. The British Line of Succession
    12. The Six Star General
    13. The 1960 Popular Vote
    14. Jesse Owens vs Usain Bolt: Who Would Win?
    15. Zero, My Hero
    16. The Army That Never Was
    17. Time Zone Oddities
    18. Rutherford B. Hayes is a Big Deal in Paraguay
    19. The Last Crow War Chief
    20. Disco Demolition Night
    21. The Greatest Simplest Idea in the World
    22. Stealing the Mona Lisa
    23. Ancient Rome and Ancient China
    24. The Greatest Thing Since Sliced Bread
    25. How Many Countries Are There?
    26. Broccoli, James Broccoli
    27. The 1904 Olympic Marathon
    28. The REAL Independence Day
    29. The Most Dominant Athlete Ever
    30. President Tyler’s Grandsons
    31. The Empire that Never Existed