May 7, 2012 | 1
Professional "free divers" have no trouble holding their breath for minutes at a time. What stops us from doing the same? In this episode, Scientific American's Katherine Harmon--and Katherine Harmon--explore the limits of human physiology.
Deadline: Jun 29 2013
Reward: $7,000 USD
The Seeker for this Challenge desires proposals for chemical methods that could rapidly degrade a dilute aqueous solution
Deadline: Jul 15 2013
Reward: $5,000 USD
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