Today's megafauna are tiny compared with history's largest dinosaurs. Learn a few theories about how these animals got so big in this episode of BrainStuff, based on this article: https://animals.howstuffworks.com/extinct-animals/why-were-prehistoric-animals-big.htm

How Do Search-And-Rescue Dogs Work?
10:52

BrainStuff Classics: Why Do We Drop a Ball on New Year's Eve?
05:17

Can You Really Die of Boredom?
08:16