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  1. Earth

    Tunguska, a century later

    Asteroid or comet blamed for Siberian blast of 1908

    By Sid Perkins
  2. Space

    Dispatch from Mars, Sol 9

    The Phoenix Lander's robotic arm scoops its first experimental sample, and scientists prepare to start their scientific studies on the Martian soil.

    By Ashley Yeager
  3. Earth

    TNT buster

    A bacterium from Yellowstone could help break down TNT.

    By Rachel Ehrenberg
  4. Health & Medicine

    Brain trauma

    Cooling the body temperature of a child who has severe brain injury doesn’t seem to help recovery, but the jury is still out.

    By Nathan Seppa
  5. Space

    Potential future fireworks

    Already bright enough to be seen with the naked eye, the star epsilon Aurigae may be trembling at the brink of a powerful outburst.