A new exhibit at the American Museum of Natural History features a 60-foot model of the dinosaur named Mamenchisaurus. The model reveals what we know and don't know about these plant-eating giants.
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
Deadline: Jul 15 2013
Reward: $5,000 USD
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