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  1. For some birds, Mr. Wrong can be alright

    What looks like the ultimate bad choice in romance—a mate from a different species—in some conditions may not be so dumb after all.

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  2. Astronomy

    Have scientists seen planets in the making?

    Astronomers may finally have glimpsed a key step in the construction of a planet.

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  3. Earth

    Even low lead in kids has a high IQ cost

    Lead can damage a young child's ability to learn and reason at exposures far lower than the limit deemed acceptable by the U.S. government.

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  4. Physics

    New probe reveals unfamiliar inner proton

    Researchers taking one of the closest looks yet into the intact proton have found an unexpectedly complex interior electromagnetic environment.