February 12, 2008: Israeli researchers have found a way to improve blood flow, and alertness, for pilots flying long hours at high altitude. These low pressure environments induce drowsiness and inattention, which can be fatal for a fighter pilot. The new Israeli method employs the same active ingredient that is used in Viagra, a prescription recreational drug that cures impotence. For pilot applications, the chemical composition of Viagra will have to be tweaked to curb its main effect, which could be distracting for a fighter pilot in combat.