There was a time when getting your daily dose of caffeine meant a simple cup of coffee or tea.
Poured into a ceramic mug, the steaming liquid tended to be enough to give most people that extra burst of energy to get out the door. Back then, you'd have to drink a heck of a lot -- 81 cups of brewed coffee, or 317 cups of black tea, for the average 195-pound U.S. male -- to reach a lethal dose.
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