Humans

  1. Health & Medicine

    Smiles Turn Away Colds

    A good mood and a relaxed attitude help keep colds away.

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  2. Health & Medicine

    Hot Pepper, Hot Spider

    Hot peppers and spider venom can cause the same sort of painful burning sensation.

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  3. Health & Medicine

    Disease Detectives

    This year's top young scientists faced medical challenges in labs at the National Institutes of Health.

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  4. Humans

    Oldest Writing in the New World

    Signs carved into a stone slab may represent the earliest known writing in the Americas.

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  5. Health & Medicine

    Getting Enough Sleep

    Kids and teens need plenty of sleep but have trouble getting enough.

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  6. Health & Medicine

    A Sour Taste in Your Mouth

    Researchers may have pinpointed how the tongue's cells detect sour tastes.

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  7. Archaeology

    Sahara cemetery

    Archaeologists uncover the remains of a Stone Age settlement in the Sahara desert.

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  8. Health & Medicine

    Sun screen

    Too much exposure to the sun's ultraviolet rays can damage human skin. That's why doctors recommend people who will be outdoors for long hours in the summer sun protect their skin.

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  9. Health & Medicine

    Germ zapper

    A compound found in nature kills certain bacteria in a new way.

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  10. Humans

    If only bones could speak

    The shape of fossil spine bones suggests that ancient human ancestors could speak.

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  11. Health & Medicine

    Prehistoric trips to the dentist

    Thousands of years ago, some people had holes drilled into their teeth.

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  12. Health & Medicine

    Attacking Asthma

    Most kids with asthma no longer have to limit their activities.

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