Wall Street futures quickly reversed course and turned positive early Friday in very volatile markets, particularly when it comes to artificial intelligence.

Futures for the S&P 500 rose 0.3%, while futures for the Dow Jones Industrial Average climbed 0.6%. Nasdaq futures edged up 0.2% after being down overnight. Yet technology-heavy Nasdaq may be on its way to its worst week since President Donald Trump rolled out his tariff policy in April.

Nvidia erased a 1.4% overnight loss, getting back to Thursday's closing price as its shares continued to ping-pong. Worries persist about a possible bubble in artificial intelligence-related shares, even after the chipmaker posted a big profit for the summer and forecast strong revenue that easily cleared analysts’ expectations.

Bitcoin continued i

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