Human bodies buried in bogs can retain some features -- like perfectly preserved skin, right down to forehead wrinkles -- for thousands of years. Learn how this natural mummification process works in today's classic episode of BrainStuff.

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