The ancient plate was _ _ _ _ _ _ _ _ in two places, but the marks were so regular it was impossible to determine if they were accidental or _ _ _ _ _ _ _ _ .
Match wits with the Mensa puzzler
| January 30, 2007
The ancient plate was _ _ _ _ _ _ _ _ in two places, but the marks were so regular it was impossible to determine if they were accidental or _ _ _ _ _ _ _ _ .
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 30 2013
Reward: $100,000 USD
The Seeker desires a method for producing pseudoephedrine products in such a way that it will be extremely difficult for clandestine che
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