How Caffeine Evolved To Help Plants Survive And Help People Wake Up

A must read.

Useful link:
http://www.nytimes.com/2014/09/04/science/how-caffeine-evolved-to-help-plants-survive-and-help-people-wake-up.html?hpw&rref=science&action=click&pgtype=Homepage&version=HpHedThumbWell&module=well-region&region=bottom-well&WT.nav=bottom-well&_r=0