What do cars in a parking lot have to do with online searches for terms like “diarrhea” and “cough”? And what do these data points tell us about the pandemic that is raging across the globe? As it turns out, a great deal.

Researchers at Harvard Medical School have used satellite imagery to track the number of cars parked at six major hospitals in Wuhan, the city of 11 million inhabitants in central China where Covid-19 originated and then spread to the rest of the world.

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This article was originally published by El País