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October 2023
  1. Christina of Sweden
  2. Ocean Gyres
  4. Partition of India and Pakistan
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. 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