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  1. Readers weigh in on deer-vehicle collisions, mouse sperm in space and more

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  2. Debate over Pluto’s planet status still carries on

    Managing editor Erin Wayman discusses the challenges of classification in science, from Pluto's planet status to the definition of life.

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  3. Physics

    50 years ago, physicists thought they found the W boson. They hadn’t

    Fifty years after a false-alarm discovery, physicists have caught the W boson and are using it to unravel mysteries of particle physics.

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  4. Paleontology

    How fossilization preserved a 310-million-year-old horseshoe crab’s brain

    A 310-million-year-old horseshoe crab’s brain was preserved in clay, thanks to an uncommon fossilization process that protected the fragile neural tissues.