Stocks fell today, with the Nasdaq experiencing its worst session since 2011, as investors took profits by selling tech shares, among others. ???The market is very skittish,??? David Pavan, a portfolio manager at ClariVest Asset Management LLC in San Diego, California, said. ???You see very sharp love and hate on a day-to-day basis. Today is a very strong preference for cheap stocks. Higher growth stocks get really hit hard.???