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The mad dash accelerated as quickly as the pandemic. Researchers sprinted to see whether artificial intelligence could unravel Covid-19’s many secrets — and for good reason. There was a shortage of tests and treatments for a skyrocketing number of patients. Maybe AI could detect the illness earlier on lung images, and predict which patients were most likely to become severely ill.

Hundreds of studies flooded onto preprint servers and into medical journals claiming to demonstrate AI’s ability to perform those tasks with high accuracy. It wasn’t until many months later that a research team from the University of Cambridge in England began examining the models — more than 400 in total — and reached a much different conclusion: Every single one was fatally flawed. 

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