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  1. Physics

    A metallic odyssey, what’s causing sunspots and more reader feedback

    Metallic hydrogen, sunspot formation, salty desalination leftovers and more in reader feedback.

    By Science News Staff
  2. Humans

    Animal hybrids may hold clues to Neandertal-human interbreeding

    The physical effects of interbreeding among animals may offer clues to Neandertals’ genetic mark on humans.

    By Bruce Bower
  3. Tech

    CT scans show first X-rayed mummy in new light

    An ancient Egyptian child became the first mummy to be X-rayed in 1896. Today, CT scans reveal new insights into the child’s life — and death.

    By Helen Thompson
  4. Tech

    XPRIZE launched new kind of space race, book recounts

    'How to Make a Spaceship' chronicles the XPRIZE challenge that helped ignite the private space industry.