@jalefkowit “Follow your gut” talked about how a freshly-cleaned toilet seat cover is immediately colonized by fecal bacteria upon first flush but these are quickly outcompeted by commensal skin microbes—until the next cleaning. So hospitals e.g. are looking at cleaning less, and opening more windows, to get more harmless commensals to coat their surfaces instead of letting only the hardiest pathogens have a chance. Awesome stuff.