Sci-Doku is a sudoku puzzle that uses letters instead of numbers, with an added twist: a science-related clue accompanies each puzzle and the answer is spelled out in one row or column of the puzzle.
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See what we're tweeting about
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 14 2013
Reward: $1,000,000 USD
This is a Reduction-to-Practice Challenge that requires written documentation and&
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