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$PDF$/READ/DOWNLOAD Viral: The Search for the Origin of COVID-19 | Chan and Ridley write with an urgency...that inspires gripping depictions of what viruses are, how infectious-disease laboratories work and wonderfully lucid descriptions of bats. . . . They powerfully recount how dangerous pathogens can both leak from a lab and emerge in nature. (New York Times Book Review)Understanding how Covid-19 started is cr