Ours is a coffee-obsessed culture. We argue over which is better: [Dunkin’ Donuts](/about/dunkin-donuts, Starbucks, or home-brewed—and any number of the little independent coffeeshops we get our fix at. There are entire news cycles devoted to the release of Starbucks holiday cups. Heck, McDonald’s was even making coffee jokes this morning on Twitter. And coffee’s a…