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Moon Smasher - July 2009A NASA satellite called LCROSS heads to the moon in the hope of finding buried water.
Secrets in the Salt - July 2009Salt deposits that formed 250 million years ago hold tantalizing hints of early life.
Bird Brains - July 2008Clues to the origins of human language are turning up in the brains of birds.
Profile: Lonnie Thompson - July 2009A climatologist struggles to save ancient history preserved in ice that is now melting.
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