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  1. Readers ask about sea level rise, the universe’s first stars and more

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  2. So much is lost when fossil treasures go private

    Editor in chief Nancy Shute discusses how science and the public lose when fossils are privately sold.

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  3. Animals

    Here are 3 people-animal collaborations besides dolphins and Brazilians

    Dolphins working with people to catch fish recently made a big splash. But humans and other animals have cooperated throughout history.

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  4. Life

    How plant ‘muscles’ fold up a mimosa leaf fast

    A mimosa plant revs up tiny clumps of specially shaped cells that collapse its leaflets, though why isn’t clear.