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Why Do Fireflies Have Blinky Bottoms?

Why Do Fireflies Have Blinky Bottoms?

Season 5 Episode 23
4:22
How Do Glaciers Move?

How Do Glaciers Move?

Season 5 Episode 26
6:30
When Is It Winter On Other Planets?

When Is It Winter On Other Planets?

Season 5 Episode 29
5:00
How Poop Shapes the World

How Poop Shapes the World

Season 5 Episode 30
3:34
Do You Really Have Two Brains?

Do You Really Have Two Brains?

Season 5 Episode 33
4:20
Why I ❤ PBS

Why I ❤ PBS

Season 5 Episode 11
2:32
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It's Okay to Be Smart

Are We All Related?

Season 5 Episode 16

In part 3 of our special series on human ancestry, we investigate how closely related we all really are. Basic math tells us that all humans share ancestors. But you’ll be amazed at how recently those shared ancestors lived. Thanks to genetic data in the 21st century, we’re even discovering that we really are all descended from one mother.