Walking Creates A Thirst For Knowledge
http://www.pnas.org/content/early/2011/01/25/1015950108.abstractA study that backs up what a lot of smart people (including PG) have been circling around lately.
http://www.blog.sethroberts.net/2010/12/15/walking-creates-a-thirst-for-dry-knowledge/ http://www.paulgraham.com/addiction.html