These toothy fish are some of the largest in North America. Learn how they've lasted 100 million years in this episode of BrainStuff, based on this article: https://animals.howstuffworks.com/fish/alligator-gar-100-million-years-old-and-still-kicking.htm

What Pranks Have Astronauts Pulled?
08:40

How Can Your Body Learn to Tolerate Cold?
10:58

How Did the War of 1812 Settle the American Revolution?
10:23