Artificial Life (Oct. 2005)

Are scientists on the verge of making living things from little more than dust? Watch now (15 mins.)

Bird Brains (July 2008)

Clues to the origins of human language are turning up in the brains of birds. Watch now (13 mins.)

Epigenetics (Jul. 2007)

Our lifestyles and environment can change the way our genes are expressed, leading even identical twins to become distinct as they age. Watch now (13 mins.)

First Primates (July 2008)

Our most distant primate ancestors, which took the stage shortly after the dinosaurs left it, were tree-dwellers the size of mice. Watch now (13 mins.)

Fish Surgery (Oct. 2005)

Veterinary medicine has caught up with Americans' love for their number one choice of pet: the fish. Watch now (6 mins.)

Frozen Frogs (Apr. 2005)

The common wood frog freezes solid every winter and then, come spring, defrosts and mates. Watch now (4 mins.)

Ivory-Billed Woodpecker (Jan. 2006)

An enchanting bird believed extinct mysteriously reappears...maybe. Watch now (7 mins.)

Killer Microbe (July 2008)

A relatively benign bug becomes a highly lethal pathogen, known to U.S. soldiers as Iraqibacter. Watch now (8 mins.)

Of Mice and Memory (June 2008)

Mice placed in enriched environments can recover lost memories, giving hope to those who study Alzheimer's. Watch now (12 mins.)

Personal DNA Testing (July 2008)

Genetic testing to assess risk factors for a handful of serious illnesses is now commercially available. But is it a good idea? Watch now (12 mins.)

Profile: Bonnie Bassler (Jan. 2007)

Her insight into how bacteria "talk" has launched a revolution in biological and medical research. Watch now (13 mins.)

Profile: Erich Jarvis (Oct. 2005)

The work of neuroscientist Erich Jarvis demonstrates the power of open-mindedness in the lab. Watch now (12 mins.)

Profile: Judah Folkman (July 2008)

Once scorned for his ideas about how cancer grows, the late Judah Folkman is now hailed as a visionary. Watch now (11 mins.)

Profile: Edith Widder (July 2008)

Meet a marine biologist and explorer who has engineered new ways to spy on deep-sea creatures. Watch now (9 mins.)

Sleep (Jul. 2007)

Why do we need sleep? Part of the answer may be to strengthen memories. Watch now (13 mins.)

Stem Cells Breakthrough (July 2008)

Three separate teams overcome a biomedical hurdle—creating stem cells without the use of human embryos. Watch now (13 mins.)