NOVA scienceNOW

How to Speak Walrus Two experts—and two walruses—demonstrate in this audio slide show. Hear the walruses.
Hunt for Alien Earths Astronomers may be on the brink of finding Earth-like planets beyond our solar system. Watch the program.
Profile: Luis von Ahn A computer scientist finds novel ways to stop spammers and harness the brainpower of millions of people. Meet Luis von Ahn.
Cancer Nanotech Structures smaller than a single red blood cell could revolutionize cancer diagnosis and treatment. Learn about it.
Exploring the Arctic Seafloor See some of the first imagery ever shot on the Arctic Ocean seabed, and what it's telling us about living at extremes. Check it out.

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The Science of Picky Eaters
Don't like broccoli? Your DNA may explain why, because your sense of taste is largely encoded in your genes.
Profile: Pardis Sabeti
By night she's a rocker. By day, she's a Harvard geneticist tracking the evolution of the human genome.
First Primates
Our most distant primate ancestors, which appeared soon after the dinosaurs died out, were the size of mice.
Moon Smasher
A NASA satellite called LCROSS heads to the moon in hope of finding buried water.
Dark Matter
Physicists have a sneaking suspicion that most of the universe is held together by a mysterious, invisible substance.
Public Genomes
Many people are paying to have their DNA tested. Others are sharing their genomes on the Internet. Are they crazy?