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  1. Health & Medicine

    Step up to denser bones

    Step aerobics proved better than resistance exercises for building bone density.

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  2. Planetary Science

    Comet mission loses some focus

    A camera aboard the Deep Impact spacecraft, set to fire a projectile into the icy heart of Comet Tempel-1 on July 4, is slightly out of focus.

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  3. Earth

    Balloons, condoms release likely carcinogens

    Balloons and condoms that come in contact with body fluids discharge chemicals suspected of being human carcinogens.

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  4. Health & Medicine

    Company pulls pain drug from market

    The Food and Drug Administration has asked Pfizer to stop selling its prescription pain medication valdecoxib (Bextra).