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  1. Animals

    Killer sex, literally

    Videotapes of yellow garden spiders show that if a female doesn't murder her mate, he'll expire during sex anyway.

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  2. Tech

    Giving solar cells the rough treatment

    A new solar cell design that traps photons in the crevices of a bumpy surface uses low-cost materials and may make these cells more commercially appealing.

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  3. Earth

    Antimosquito coils release toxic fumes

    Researchers have measured several pollutants in smoke emitted from so-called mosquito coils, which people burn at night to fend off insects.

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  4. Adults’ brains show temperamental side

    Using brain-imaging techniques, psychologists have identified possible neural locations underlying shyness or gregariousness.