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It's Okay to Be Smart
Why Do We Cry?
Season 6
Episode 20
Why do we cry? It’s weird. Humans leak water out of their faces when they get sad. Are we the only animals that do this? What does it mean? What is it for? Here’s the science of human tears!
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9:42
We explore why animals like whales, elephants, and other large animals not get cancer.
10:16
The real magic of mirrors is far stranger and more interesting, as you’re about to learn.
17:56
Neuroscientist David Eagleman talks about illusions that make the moving picture possible.
15:15
We explore what we can actually do about pollution.
9:21
The biggest thing that has ever lived on Earth… is a tree? Hard to believe, but it’s true!
15:33
We travel to Great Sand Dunes National Park to climb the largest sand dunes in America.
