Washoe is a chimp more like a person: she talks with her hands. NOVA visits with Washoe and her teachers—Professor Allen Gardner and Dr. Trixie Gardner—to learn more about this unusual animal.

In the program, leading physicists delve into the mystery of whether time travel is possible, and if so, how one might go about building a time machine.

Experts struggle to save the City of Canals before it vanishes beneath the waves.