How did a little-known Chinese start-up cause the markets and U.S. tech giants to quake? Here’s what to know. Artificial Intelligence, Social Media, Computer Chips, Computers and the Internet, Regulation and Deregulation of Industry, Start-ups, International Relations, Data Centers, DeepSeek Artificial Intelligence Co Ltd, Google Inc, Meta Platforms Inc, Microsoft Corp, NVIDIA Corporation, OpenAI Labs, China How did a little-known Chinese start-up cause the markets and U.S. tech giants to quake? Here’s what to know. NYT > Business