
Mass Extinction - What caused the mother of all extinctions 250 million years ago? 1918 Flu - A virus that killed up to 50 million people is brought back to life to decipher its deadliness. Profile: Cynthia Breazeal - A daring engineer designs robots to communicate and interact the way people do. Papyrus - Scraps of writings from a garbage dump in ancient Egypt reveal what life was like 2,000 years ago.
Dark Matter - Turns out most of the universe is held together by a mysterious, invisible substance. Of Mice and Memory - Mice placed in enriched environments can recover lost memories, giving hope to those who study Alzheimer's. Profile: Hany Farid - This self-proclaimed "accidental scientist" is a digital detective inventing new ways to tell if photos have been faked. Wisdom of the Crowds - Ask enough people to estimate something, and their combined guesses will get you surprisingly close to the right answer.