Coffee is serious business. We Americans drink about 400 million cups of it per day and spend several billion dollars on it each year. It’s the most popular drug on earth, and certainly the most socially acceptable. In many ways, coffee’s the closest thing we’ve got to a universal, daily ritual, as just about every morning, billions of people across the planet prostrate themselves before the holy, energy-giving legume. It also hails from the same place the earliest members of our species do: East Africa (Ethiopia, to be exact). That the most industrious animal ever to walk the planet and the psychoactive legume that fuels said industry both hail from the same place on earth is pure poetry. Coffee’s also delicious. I’d say you’d have to pry my coffee from my cold, dead fingers, only the ensuing struggle would slosh it all onto the floor, and that would be such a waste. Yet it’s also considered to be a vice, one of those substances that “everyone knows” is bad for you. Is it?   (This Mark's Daily Apple article was written by Mark Sisson, and is narrated by Tina Leaman)