OpenAI CEO Sam Altman (L) shakes hands with Microsoft Chief Technology Officer and Executive VP of Artificial Intelligence Kevin Scott during the Microsoft Build conference at the Seattle Convention Center Summit Building in Seattle, Washington, U.S., on May 21, 2024.Investors can't get enough of artificial intelligence, despite worries over the sector's excessively high valuations.The S&P 500, Dow Jones Industrial Average and Nasdaq Composite rose Tuesday stateside, with all three notching new intraday hig ...