How Caffeine Evolved to Help Plants Survive and Help People Wake Up - The New York Times

http://www.nytimes.com/2014/09/04/science/how-caffeine-evolved-to-help-plants-survive-and-help-people-wake-up.html

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First saved: 2015-Aug-07 (Fri)
Last checked: 2015-Oct-28 (Wed), response 303