There is some new thinking floating around out there that coronavirus lives freely in the very air we breathe and is, therefore, literally inescapable. If that is true, then is it also possible that this pandemic can be a mechanism for natural selection to insure the fittest survive? Has something like this ever happened before in the eons of history? Is something like this one of the possible reasons that Mars is a dead desert planet? Is a civilization-ending microbiological attack even a possibility?