BANGKOK (AP) — Asian shares tumbled on Tuesday, with benchmarks in Tokyo and Seoul sinking more than 3%, after Nvidia and other artificial-intelligence -related shares pulled U.S. stocks lower. U.S. futures dropped, with the contract for the S&P 500 down 0.6% while the future for the Dow Jones Industrial Average was down 0.4%. Computer chip giant Nvidia, at the center of the craze over AI , is due to report its earnings on Wednesday. Worries that stock prices of such companies have shot too