The U.S. stock market experienced a downturn on Tuesday, following mixed movements on Monday. Futures of major indices, including the S&P 500 and Nasdaq, were in the red. Concerns over a potential AI bubble have intensified, with notable investor Michael Burry making significant put option bets against Nvidia Corp. and Palantir Technologies Inc. . Meanwhile, the U.S. Government shutdown has extended to its 34th day, raising alarms about its economic impact.Major U.S. indices closed lower, with the Dow Jones ...