Chinese stonewalling means it’s unlikely the world will ever know Covid-19’s exact origins. Yet many avenues of investigation remain unexplored that could yield lessons for the future.

Until this year much of the political and scientific establishment wrote off the idea that Covid-19 began circulating in China after an accidental lab leak. This groupthink was inexcusable, given that the Wuhan Institute of Virology (WIV) for years had studied and modified bat coronaviruses.

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