The newest noteworthy omicron subvariant, called BA.2.75 (and unofficially nicknamed “Centaurus”), has already turned up in the Bay Area and in spots all over the globe. It appears to have a large number of mutations that could make it more infectious and help it evade prior immunity. Meanwhile, whatever happened to sterilizing surfaces? Here’s the lowdown on whether that matters anymore. Probably much more important is improving indoor air circulation, which a growing number of scientists are pushing to help battle the coronavirus.