How's this for dual purpose? Zhao Wencai and Li Zhoumu, two graduate students at the China University of Geosciences, have concocted a prototype device which checks for two important bits of information before allowing a car to start. First, it scans your fingerprint to make sure you're on the authorized driver database; second, it takes a long, hard look (okay, so maybe 20 seconds isn't all that long) at the sweat on your digit to determine just how sober or inebriated you are. There's no telling when this will hit motorcars en masse, but we'd say the whole thing needs to get a whole lot small
