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  1. Space

    Surprising signal

    Potential contaminant found on Red Planet does not rule out its prospect for habitability.

    By Ashley Yeager
  2. Life

    Eat less, weigh more

    Separate neurons in the nematode brain control eating and fat-building. The discovery may help explain some mysteries of obesity.

    By Tina Hesman Saey
  3. Space

    In the moon’s shadow

    NASA broadcasts Aug. 1 total solar eclipse.

    By Ashley Yeager
  4. Life

    Time to chill

    Well-preserved fossils deposited in an Antarctic lake about 14 million years ago pin down when a large part of the now-icy continent most recently dipped below freezing.

    By Sid Perkins

  5. Primeval Kinship: How Pair-Bonding Gave Birth to Human Society

    by Bernard Chapais, Harvard Univ.