The dollar weakened against the Japanese yen and oil prices rose. Gains for some technology companies reporting strong earnings failed to lift shares in Tokyo, where the Nikkei 225 lost 0.2% in morning trading to 53,274.71. The S&P 500 lost less than one point to 6,978.03 points. Nvidia, the stock that’s become the poster child of the AI boom, climbed 1.6% and was the strongest single force lifting the S&P 500. Apple slipped 0.7%, the single heaviest weight on the S&P 500.