The day is growing ever closer when Washington may have to add to its agenda with Beijing a nettlesome item it has long sought to avoid: the increasingly likely fact that China let the SARS2 virus escape from the Wuhan lab where it was concocted, setting off the Covid-19 pandemic that killed some 7 million people globally and wrought untold economic havoc. New documents may explain why no one has been able to find the SARS2 virus (aka SARS-CoV-2) infesting a colony of bats, from which it might h...