My dangerous idea is that what’s needed to attain optimal brain performance — with or without prior brain exercise — is a 24-hour period of absolute solitude. By absolute solitude I mean no verbal interactions of any kind (written or spoken, live or recorded) with another human being. I would venture that a significantly higher proportion of people reading these words have tried skydiving than experienced one day of absolute solitude. Leo Chalupa

From the edge.org “Dangerous Question of 2006″ survey. This is the best idea I’ve heard in a while.