BrainStuff Classics: Was Earth's Oldest Rock Found on the Moon?

The oldest known intact Earth rock was collected on the moon in the 1970s. Learn how researchers think it got there it in this classic episode of BrainStuff.

What Were Prehistoric 'Hell Pigs'?

Enormous, pig-like omnivores with bone-barbed faces and long tusks once hunted and fought throughout what's now North America, Eurasia, and Africa. Learn about the entelodonts in this episode of BrainStuff, based on this article: https://animals.howstuffworks.com/extinct-animals/prehistoric-hell-pi…

When Did We Start Calling American Citizens 'Consumers'?

Sometime in the 1900s, Americans began referring to themselves as consumers more often than as citizens. Learn how this mindset can make a real difference in how we take responsibility for our communities in today's episode of BrainStuff, based on this article: https://people.howstuffworks.com/amer…

How Does Saliva Work?

Saliva is something you probably (hopefully?) don't think about too much, but it helps you speak, eat, taste, and even digest. Learn about the wonders of spit in this episode of BrainStuff, based on this article: https://health.howstuffworks.com/human-body/systems/digestive/saliva-change-food.htm

Who Was Harriet Tubman?

Harriet Tubman helped people escape slavery, ran intelligence missions for the Union during the Civil War, and set up the first nursing home for Black Americans. Learn more about her in this episode of BrainStuff, based on this article: https://history.howstuffworks.com/historical-figures/harriet-t…

Is Pluto Really Not a Planet?

Although the International Astronomical Union demoted Pluto from a planet to a dwarf planet in 2006, some scientists think it deserves to be reinstated. Learn why in this episode of BrainStuff, based on this article: https://science.howstuffworks.com/pluto-is-it-planet-after-all.htm

How Do Flying Snakes Work?

Flying snakes don't really fly, but they can glide long distances from rainforst treetops. Learn what we know (and don't know!) about them in this episoe of BrainStuff, based on this article: https://animals.howstuffworks.com/snakes/flying-snakes.htm

Who Is Uncle Sam?

This stern, patriotic character goes back to the early 1800s, but became an icon thanks to American propaganda during WWI. Learn more about Uncle Sam in this episode of BrainStuff, based on this article: https://people.howstuffworks.com/uncle-sam-man-myth-legend.htm

BrainStuff Classics: Should You Be Squatting More?

Short answer: Yeah, probably. Most Westerners have traded squatting for sitting and standing, to the detriment of our backs and joints. Learn the benefits of a good squat -- and how you can incorporate them into your day -- in this classic episode of BrainStuff.

BrainStuff Classics: Why Don't Penguin Feet Freeze?

Standing barefoot on a glacier, human feet would freeze solid -- but penguin feet are fine. Learn why in this classic episode of BrainStuff, based on this article: https://animals.howstuffworks.com/mammals/why-penguin-feet-dont-freeze.htm