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  1. Planetary Science

    A defenseless Mars is losing its atmosphere

    Measurements of Mars’ atmosphere leaking into space could help scientists explain how the Red Planet lost its once life-friendly climate.

    By Christopher Crockett
  2. Archaeology

    Mystery still surrounds Neandertals

    Neandertals’ relationship to modern humans is still a matter of debate.

    By Tina Hesman Saey
  3. Astronomy

    More mysterious extragalactic signals detected

    Five more fast radio bursts from other galaxies have shown up and one of them is a double.

    By Christopher Crockett
  4. Genetics

    Water bears are genetic mash-ups

    Drying out may help tardigrades soak up new DNA, which in turn aids the water bears in withstanding stress.