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  1. Humans

    Not really nine months

    Gestation length varies greatly.

    By Science News
  2. Earth

    Life under ice

    Lake Vostok may harbor ingredients for a complex subglacial ecosystem.

    By Rachel Ehrenberg
  3. Humans

    How We Do It

    The Evolution and Future of Human Reproduction by Robert Martin.

    By Cristy Gelling
  4. Psychology

    What Makes a Hero?

    The Surprising Science of Selflessness by Elizabeth Svoboda.

    By Sid Perkins
  5. Earth

    Breakups maintain barchan dune fields, somehow

    Two new theories try to explain how the crescent-shaped sand mountains persist.

    By Erin Wayman
  6. Life

    Bats can carry MERS

    DNA of a deadly respiratory virus has been found in a Saudi Arabian mammal.