Bloomberg Philanthropies' Mayors Challenge is a competition to inspire American cities to generate innovative ideas that solve major challenges and improve city life. The Mayors Challenge will award one $5 million grand prize and four $1 million prizes to the cities that come up with the boldest and most replicable ideas. Follow the conversation on Twitter @BloombergDotOrg hashtag: #MayorsChallenge or on Facebook at www.facebook.com/BloombergDotOrg
