Nvidia struggles to recover after epic DeepSeek mauling

Nvidia and other major U.S. tech stocks were jittery on Tuesday, fluctuating between gains and losses after a sharp drop the day before, fueled by concerns over whether the AI boom justifies the massive investments pouring in. Nvidia, whose chips power much of the AI boom and have become emblematic of the frenzy, was in focus again. The stock dipped 0.8% after initially gaining, following a nearly 17% plunge on Monday—its worst drop since the 2020 COVID crash.