What you will find emerging out of the 117 essays written in response to the 2006 Edge Question — "What is your dangerous idea?" — are indications of a new natural philosophy, founded on the realization of the import of complexity, of evolution. Very complex systems — whether organisms, brains, the biosphere, or the universe itself — were not constructed by design; all have evolved. There is a new set of metaphors to describe ourselves, our minds, the universe, and all of the things we know in it.