Something a little differant, I share the many things I know about Organic issues, but I wanted to go beyond by sharing another pastime, one of them being chess. You will have trouble finding a better site for chess than Gameknot where you can Play Chess Online.
Below is a Daily Chess Puzzel presented by a great site that is dedicated to chess. This puzzel changes every day. It's a great way to improve your game, and its Free. Give it a try.