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Why ChatGPT and other AI chatbots make things up

Google's own chatbot got a fact wrong in an ad for itself, and that same day Google's parent company lost about $100 billion in value. AI chatbots like ChatGPT can invent a date, a name or a whole story, in the same calm voice as the truth. See why: a chatbot guesses the next words instead of looking facts up. Learn why famous facts come out right and rare ones wrong, what an AI hallucination is, why a sure tone proves nothing, and one quick test to catch a guess.