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Today's most-read story is:

What Came First: Viruses or Cells?

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What Came First: Viruses or Cells? (Sep 05, 2008)
A Warm Breath of Carbon Dioxide (Sep 04, 2008)
Lukewarm Supervolcano (Sep 03, 2008)
Earth's Leaky Atmosphere (Sep 02, 2008)
Mars Research in Polar Bear Country (Sep 01, 2008)
Climbing Out of a Crater (Aug 31, 2008)
Primitive Pancake (Aug 30, 2008)
Mapping Planets, Moons and Asteroids (Aug 29, 2008)
Drilling Down to Alien Oceans (Aug 28, 2008)
Tracing Tiger Stripes (Aug 27, 2008)

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