A 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
Walking Creates A Thirst For Knowledge
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Re: Walking Creates A Thirst For Knowledge
#2Abstract (I can't access the paper) mentions aerobic exercise training and lessened memory loss. But I like the title.