| Name | First Aired | Runtime | Image | |
|---|---|---|---|---|
| S2021E01 | Can You Erase Someone From History? |
January 10, 2021
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| S2021E02 | The Disappearance of Bobby Dunbar |
January 17, 2021
|
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| S2021E03 | Who Invented Silly String? |
January 24, 2021
|
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| S2021E04 | How Earth Was Named |
January 31, 2021
|
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| S2021E05 | License Plates |
February 7, 2021
|
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| S2021E06 | Who Invented Conversation Heart Candies? |
February 14, 2021
|
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| S2021E07 | Ribena |
February 21, 2021
|
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| S2021E08 | Collective Nouns |
February 28, 2021
|
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| S2021E09 | Foods That Can Poison/Kill You |
March 7, 2021
|
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| S2021E10 | A Lil' Mars Music |
March 14, 2021
|
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| S2021E11 | Spiro Agnew |
March 21, 2021
|
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| S2021E12 | The Man Who Stuck His Head in a Particle Accelerator |
March 28, 2021
|
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| S2021E13 | Can plants see? |
April 4, 2021
|
||
| S2021E14 | What's the Most Popular Birthday? |
April 11, 2021
|
||
| S2021E15 | How Disease Eradication Works |
April 18, 2021
|
||
| S2021E16 | Do Serial Killers Ever Just...Stop? |
April 25, 2021
|
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| S2021E17 | The "Uh-oh!" History of SpaghettiOs |
May 2, 2021
|
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| S2021E18 | All About Centipedes |
May 9, 2021
|
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| S2021E19 | Kick 'em Jenny |
May 16, 2021
|
||
| S2021E20 | Triggers vs. "Glimmers" |
May 23, 2021
|
||
| S2021E21 | Why Do We Yawn? |
May 30, 2021
|
||
| S2021E22 | The Swedish Hotline Riots |
June 6, 2021
|
||
| S2021E23 | Why Is it Dark at Night? |
June 13, 2021
|
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| S2021E24 | COLOSSAL SQUID |
June 20, 2021
|
||
| S2021E25 | Italics (feat. font designer Brian Willson) |
June 27, 2021
|
||
| S2021E26 | How Fireworks Work |
July 4, 2021
|
||
| S2021E27 | New York's 6-Million-Year-Old Caves |
July 11, 2021
|
||
| S2021E28 | The Golden Blood Type |
July 18, 2021
|
||
| S2021E29 | The Isabella Stewart Gardner Museum Heist |
July 25, 2021
|
||
| S2021E30 | Who Invented the Equal Sign (=)? |
August 1, 2021
|
||
| S2021E31 | Do Lobsters Feel Pain? |
August 8, 2021
|
||
| S2021E32 | Swift-Tuttle & The Perseids |
August 15, 2021
|
||
| S2021E33 | Guest Episode: Hamburgers |
August 22, 2021
|
||
| S2021E34 | Heat Exhaustion v. Heat Stroke |
August 29, 2021
|
||
| S2021E35 | Why It's Weird That Americans Refrigerate Milk |
September 5, 2021
|
||
| S2021E36 | The Legend of "For Sale: Baby shoes, never worn" |
September 12, 2021
|
||
| S2021E37 | How Do Coupons Work? |
September 19, 2021
|
||
| S2021E38 | The Pollock Twins |
September 26, 2021
|
||
| S2021E39 | The Pinnacles |
October 3, 2021
|
||
| S2021E40 | Why are jeans blue? |
October 10, 2021
|
||
| S2021E41 | How Many Books Are There in the World? |
October 17, 2021
|
||
| S2021E42 | When Clowns Kill |
October 24, 2021
|
||
| S2021E43 | Horror vs. Terror |
October 31, 2021
|
||
| S2021E44 | Why Do We Do Daylight Saving Time? |
November 7, 2021
|
||
| S2021E45 | How Master Keys Work |
November 14, 2021
|
||
| S2021E46 | Do Eclipses Mess With Solar Power? |
November 21, 2021
|
||
| S2021E47 | Scary Thanksgiving Parades |
November 24, 2021
|
||
| S2021E48 | What Is Wind Chill? |
December 5, 2021
|
||
| S2021E49 | Word Fossils |
December 12, 2021
|
||
| S2021E50 | The WOW! Signal |
December 19, 2021
|
||
| S2021E51 |
Undecember
season finale
|
December 26, 2021
|
No artwork of this type.
No artwork of this type.
No artwork of this type.