Prediction markets that don't involve money have also had some success recently. http://www.npr.org/blogs/parallels/2014/04/02/297839429/-so-you-think-youre-sma

Prediction markets that don't involve money have also had some success recently. http://www.npr.org/blogs/parallels/2014/04/02/297839429/-so-you-think-youre-smarter-than-a-cia-agent http://www.npr.org/blogs/parallels/2014/04/02/297839429/-so-... For an easy to join one that I work on shameless plug checkout https://scicast.org https://scicast.org