John French has spent decades collecting moist towelettes — from Lufthansa, KFC, British Airways, and a set of Star Trek tie-ins captioned “Live long and prosper!” — and cataloguing them with the earnestness of a real institution. It is one: the museum has a physical home in Room 100 of the Abrams Planetarium at Michigan State University, open Tuesday through Friday. The site still lists a DIY towelette recipe (witch hazel, glycerine, paper towels) for anyone who runs out.