OpenAI CEO Sam Altman (L) speaks with Microsoft Chief Technology Officer and Executive VP of Artificial Intelligence Kevin Scott during the Microsoft Build conference at Microsoft headquarters in Redmond, Washington, 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 highs. The major averages were juiced ...