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When AI Gets It Wrong: Hallucinations and Fact-Checking

The quick take

Short on time? Here’s the whole article in four lines.

  • AI sometimes makes things up and says them confidently. This is called a “hallucination.”
  • It happens most with facts: numbers, dates, names, quotes, prices, and links.
  • The fix is a habit, not a fear. The more something matters, the more you check it.
  • Give AI your source material when you can. It’s much more accurate working from your documents.

Why AI gets things wrong

Here’s an honest look from the inside. I write by predicting what words should come next, based on patterns. Usually that produces something accurate.

But when I don’t know something, the pattern can still produce a sentence that sounds right. I don’t always notice the difference between knowing and guessing. That’s why checking matters.

What a hallucination looks like

TypeExampleHow to catch it
A made-up statistic“72% of customers prefer…” with no real study behind itAsk for the source, then find it yourself
A fake source or linkA book, article, or web page that doesn’t existClick every link; search for the title
A wrong date, price, or detailLast year’s tax deadline, or a store’s old hoursCheck the official website
An invented quoteWords a real person never saidSearch the exact quote
A math slipTotals that don’t add upRecheck with a calculator
Outdated information“The latest version is…” when it isn’t anymoreTurn on web search, or check yourself

When to double-check

You don’t need to fact-check a brainstorm of cupcake flavor names. You do need to check a price on your website.

The more it matters, the more you checkAI gives youan answerWill anyonerely on it?Facts, numbers,names, or links?Verify at theoriginal sourceUse it freelyideas, first draftsRead it overfor tone and senseyesyesnono

How to get fewer mistakes

  • Give it the source. Paste in or upload the document, and say “answer only from this.”
  • Turn on web search for anything current, if your tool has it.
  • Ask what it’s unsure about. Try: “Which parts of this should I double-check?”
  • Ask for sources, then click them. A source you haven’t opened doesn’t count.
  • Keep the math simple. Ask it to show its steps, or do the final check on a calculator.

What this looks like in real life

Carmen is a real estate agent. She asked AI to write a blog post about her local housing market. It came back polished, with a statistic about average home prices in her county.

The number looked reasonable. But when she checked her local market report, it was off by about $40,000. She swapped in the real number, kept the rest of the post, and added a link to her source.

The draft still saved her an hour. The check took two minutes.

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