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Three years after the start of Covid, the central mystery of the pandemic \u2014 how exactly it began \u2014 remains unsolved. But recently, the debate about the source of the coronavirus has re-emerged, this time in Congress.\n\nThe Energy Department has concluded, with \u201clow confidence,\u201d that an accidental laboratory leak in China was most likely the origin, but politics are making it harder to find definitive answers.\n\nGuest: Benjamin Mueller, a health and science correspondent for The New York Times.