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  1. Heat-Seeking Missiles: Sperm may follow rising temperature to egg

    In a process called thermotaxis, sperm cells may use a temperature gradient in the fallopian tubes to find their way to an unfertilized egg.

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  2. Health & Medicine

    Rackets and Radicals: Noise may cause gene damage in heart

    Exposure to loud, continuous sound can scatter free radicals within heart tissue and cause injury to cells' DNA even after the din subsides, new animal research suggests.

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  3. Chemistry

    Shark Sense: Gel helps animals detect thermal fluctuations

    New studies suggest that clear jelly under sharks' skin can enable the animals to detect minute changes in seawater temperature—potentially leading them to prey.