How much caffeine is too much?

A lethal dose of caffeine is thought to be roughly 10 grams — about the mass of your standard #2 pencil. That converts to a whopping (but basically undrinkable) 4.69 gallons of coffee, or 120 standard cans of Red Bull. Still, 2012 saw several deaths linked to energy drinks in the United States — five were attributed to … » 2/08/13 11:26am 2/08/13 11:26am