Season 3, Episode 1 Dark Matter; Alzheimer's-Memory Mice; Hany Farid; Wisdom of the Crowd

First Aired: June 25, 2008

The season opener visits an abandoned mine where scientists are trying to prove the existence of dark matter. Also: an experiment that's restored memories to forgetful mice that may, one day, help Alzheimer's patients; a profile of Dartmouth computer-science professor Hany Farid, who has created a computer program to determine the authenticity of a photograph; a comic song in honor of aristocratic British scientist Francis Galton (1822-1911).