If there were a drug that would make you smarter, would you take it? Today an increasing number of healthy people are using drugs without a prescription as a way to improve their mental function. It's called neuroenhancement and if you want to find someone who's trying it out, just visit a college campus. That's where a surprising number of students are turning to drugs like Adderall and Ritalin, originally developed to treat attention disorders, to boost their brain power and help them make the grade