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The ascendance of DeepSeek, a relatively cheaply made Chinese A.I. app, is sending jitters through Silicon Valley and led to a big selloff on Wall Street. Investors feared that cheaper technology from China may present challenges to American A.I. businesses. There were also American national security concerns. NBC News' Brian Cheung reports.
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Always meet the seller in person and inspect the item before making a purchase. Avoid transactions involving shipping or escrow services. Never give out your financial information. Read more tips