Some buzz on coffee

Clearly, there's something about caffeine that keeps us coming back for more - even if scientists can't say for sure that it's entirely safe. "Some 85% of world's population use substantial amounts of caffeine on a regular basis, " says Bennett Weinberg, co-author with Bonnie Bealer of The World of Coffee and The Caffeine Advantage. "That's far more than those who use alcohol, nicotine and all other drugs put together."