U.S. shares gain; dollar rises in May Day trading

By Sam Forgione NEW YORK (Reuters) - U.S. shares gained on Friday after two straight sessions of losses on a rebound in healthcare and technology stocks, while the dollar rose from nine-week lows on signs that the U.S. economy may be stabilizing. Apple shares were higher and were the biggest driver on the Nasdaq and S&P 500. All major European markets except London, its biggest, were closed on Friday for the May Day holiday, while many Asian markets were also shut. London's FTSE 100 ind