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  1. Earth

    How deadly, fast-moving flows of volcanic rock and gas cheat friction

    Mixtures of hot volcanic rock and gas called pyroclastic flows travel so far by gliding on air, a new study suggests.

    By Maria Temming
  2. Math

    Mathematicians may have found the fastest way to multiply huge numbers

    A new theoretical method for multiplying enormous figures appears to achieve a speed first predicted decades ago.

    By Emily Conover
  3. Science & Society

    The delight of discovering an asteroid that spits

    Editor in Chief Nancy Shute discusses recent news about the asteroid Bennu and Kuiper Belt–object Ultima Thule.

    By Nancy Shute
  4. Health & Medicine

    Readers seek answers to stories about shingles, Neandertal spears and more

    Readers had questions about Neandertal spears, Earth’s inner core and more.