f you believe， as I do， that darkness shrouded the Earth until someonethought to brew coffee at breakfast，at which time the stupor lifted，the neurons engaged and the Enlightenment dawned， then RobertBohannon may be your new best friend. Dr. Bohannon is the North Carolinamolecular biologist who six years ago sat down before a glass of milk and adoughnut and had the audacity to think that there was something wrong withthat picture，Why not add caffeine－to the doughnut?