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  1. Physics

    How bicycles keep the rubber on the road

    An international collaboration tries to explain the surprising stability of two-wheeled travel.

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  2. Life

    New light on moths gone soot-colored

    Researchers trace the mutation that led to the dramatic darkening of an insect's wings during England's industrial revolution to a region rich in genes that control color patterns.

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  3. Life

    Dangerous dinos came out after dark

    Predatory dinosaurs probably stalked the night, scientists say.

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  4. Space

    XENON100 fails to find dark matter

    A hundred days of solitude for an experiment designed to rendezvous with the universe's missing mass put new limits on the elusive material's properties.