Historians tell us that caffeine in coffee helped Western civilization "sober up" and get down to business. Now scientific research shows that at low doses, caffeine improves performance on mental tasks, especially in people who are already tired.
Today's commercial coffee production is based on only a tiny slice of the genetic varieties that have grown since prehistoric times. And that's a problem, because it leaves the world's coffee supply vulnerable to shocks like climate change, or the leaf rust currently ravaging Latin American coffee farms.
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