1. Health & Medicine

    Sweeeet! The skinny on sugar substitutes

    Millions of people use artificial sweeteners, but are they safe?

  2. Health & Medicine

    Heavy sleep

    To maintain a healthy weight, kids need to get enough sleep.

  3. Health & Medicine

    A recipe for happiness

    Want to be happier? Recent studies show that science can help.

  4. Humans

    Ancient cave behavior

    In a South African cave, scientists have found the oldest evidence of people acting like modern humans.

  5. Humans

    A Long Haul

    A new study of stone tools suggests that ancient Polynesian sea voyagers traveled thousands of miles in their canoes.

  6. Health & Medicine

    The buzz about caffeine

    Is caffeine bad or good for you? The answer is: a little of both.

  7. Health & Medicine

    Toxic Dirt + Avian Flu = Science Fair Success

    Fifteen-year-old Nolan Kamitaki shows what it takes to become one of America's top young scientists.

  8. Health & Medicine

    The electric brain

    Electrical implants allowed a brain-damaged man to talk, eat, and move again.

  9. Humans

    Chicken of the Sea

    Chickens may have crossed the Pacific Ocean along with early Polynesian explorers.

  10. Health & Medicine

    A big discovery about little people

    Humans may have once walked the Earth with tiny people—a possible newly discovered species that scientists have nicknamed "hobbits."

  11. Health & Medicine

    Don’t Eat That Sandwich!

    If you drop a sandwich on the floor, how quickly does it pick up bacteria?

  12. Health & Medicine

    A Better Flu Shot

    A new kind of vaccine that's made in caterpillar cells prevents influenza.