Some of the world's leading experts in various fields were brought together to dream up more challenges for the X Prize Foundation, a charitable group which rewards innovation with cash. Alpheus Bingham, co-founder of InnoCentive, says government agencies from NASA to the city of Chicago now use his company's platform to offer prizes. And there is even a bill in the American Congress that would grant every federal agency the authority to issue prizes. 'Is this a good thing? Prizes used to promote a policy are vulnerable to political jiggery pokery', says Lee Davis of the Copenhagen Business School.

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