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Why Is Everyone Suddenly Talking About COVID-19 Escaping From a Lab?

There’s been a pretty broad consensus among scientists who study viruses that the one that causes COVID-19 arose naturally and passed from animals to humans sometime in late 2019, in or near Wuhan, China. But an alternate hypothesis—that it escaped from a lab in that city—has been tossed around like a political football since the start of the pandemic, and never treated with more credulity than in