If you answered "one of Santa's reindeer" and "a popular video game from the '80s"--this episode of Instant Egghead is for you. Scientific American editor John Matson explains how our favorite space rocks differ.
Deadline: Jul 15 2013
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SciBX: Science-Business eXchange, a joint publication from the makers
Deadline: Jun 30 2013
Reward: $1,000,000 USD
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