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Why AI Makes Things Up: A Plain-Language Look at AI Hallucination

1What We Mean by AI Making Things Up2Why the AI Has No Fact-Checker Inside3Where the Gaps Come From4Spotting and Handling Made-Up Answers
Spotting and Handling Made-Up Answers

The Warning Signs Are in the Shape of the Answer

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The key idea here is that a made-up answer sounds exactly like a correct one, so listening for a doubtful tone will not help you. What you can notice is the shape of the content. The clearest sign is a specific detail you never asked for — a name, an exact date, a number, a quotation, a citation. Those are the parts the model had to produce from patterns rather than pull from a record, and they are also the parts that feel most trustworthy. A second sign is a very smooth answer to a question that should not have a smooth answer, like something obscure or very recent. And a third is a claim you simply cannot check. None of these proves the answer is wrong. They just tell you where to look first.
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You cannot hear a hallucination. You can only notice where one is likely: unsolicited specifics, suspiciously smooth answers to obscure questions, and claims you have no way to check.

Specifics you did not ask for

Names, dates, numbers, quotations, and citations are the parts of an answer the model had to generate from patterns rather than retrieve from a record. They are also the parts that feel most authoritative. That combination — high risk, high trust — is why they are the first thing to check.

Smooth answers to thin questions

When a topic is thinly covered, the patterns are weak and the model fills the hole. The result often reads more cleanly than the underlying knowledge deserves. If a question about something obscure, recent, or local comes back as polished as a question about a famous topic, the polish is the clue.

Hard-to-check claims

A source you cannot open, a study you cannot find, or a role you cannot confirm does not prove the answer is wrong. It does mean you cannot tell the difference between a real detail and an invented one, so the claim stays unverified until something outside the chat confirms it.

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