What is the best way to spend $100 million to fix one huge problem in the world today? That is the challenge laid down by the MacArthur Foundation in Chicago, distributors of the “genius grant”. They created the 100&Change competition to inspire solutions for some of the looming disasters facing people, places or the planet. The prize is one colossal grant of $100 million for the project which can make the most lasting difference to people’s lives.