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The Dow opened about 369 points, or 0.8%, lower. The S&P 500 fell by 2% and the tech-heavy Nasdaq plunged by 3.6%. The Nasdaq hasn’t closed 4% lower since September 2022. Meta last week said it would spend upward of $65 billion this year on AI development. Sam Altman, CEO of OpenAI, last year said … Read moreDeepSeek: A shocking Chinese AI advancement called DeepSeek is sending US stocks plunging