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  1. Life

    Mitochondria Gone Bad

    Problems in the cell’s energy factories power new ideas on disease and aging.

    By Laura Beil
  2. Earth

    First wave

    The presidents of two island nations draft escape plans, anticipating sea level rise.

    By Cristine Russell
  3. Climate

    Plumes of arctic haze traced to Russia, Kazakhstan

    Smoke from forest fires, agricultural burning may be substantial part of springtime plumes.

    By Sid Perkins
  4. Tech

    Two satellites collide in Earth orbit

    In an unprecedented collision, two large satellites crashed into each other in low-Earth orbit on February 10.

    By Ron Cowen
  5. Science & Society

    Kids’ gestures foretell better vocabularies

    Toddlers who gesture more at age 14 months possess larger vocabularies when entering school, new research finds.