S&P, Dow at record highs; Nasdaq turns positive for 2016

The S&P 500 and the Dow hit record intraday highs on Tuesday, while the Nasdaq turned positive for the first time this year, buoyed by rising prospects of global economic health and with Alcoa getting the U.S. earnings season off to a promising start. The S&P 500 hit 2,155.32, breaking past its previous record on Monday. The Dow hit an all-time high of 18,360.51.