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  • 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?