Ahhh... Coffee... *sighs deeply* Coffee is a labor of love from farmers far and wide. It's a fuel for all-nighters and friendships and productivity. It stimulates your brain well enough to help you save lives. It's a warm hug in a cup. Also, it's a legitimate drug. In fact, it is considered as the most commonly used psychoactive drug in the world. In the US alone, over 3,351 metric tons of coffee are consumed on a daily basis. That's about four kilograms of coffee per person annually. Here are ten more facts you probably didn't know about coffee that would keep you awake for hours.