A bot crawled thousands of studies looking for simple math errors. The results are concerning.

On August 25, Jennifer Tackett, a psychology professor at Northwestern University, got an odd email in her inbox. It was from PubPeer, an online forum where people share and discuss scientific articles. A program called “Statcheck” was writing to inform her it had been double-checking the math in her paper. And it made her a little anxious.

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