In the 1960s, advances in technology allowed brave aquanauts to explore deeper into the ocean than ever before, but the project was shut down. Learn how Sealab worked -- and how that technology is still used today -- in this classic episode of BrainStuff.

How Can Rhubarb Grow in the Dark?
10:28

How Does the Blue-Footed Booby Work?
08:41

Who Was Helen of Troy?
07:27