A library, sterile, serene and mostly food-free, isn’t the most obvious hand-sanitizer-worthy place. But think about it: They’re filled with sneezing kids, wheezing elderly folks and lots and lots of surfaces — shelves, desktops, counters, computer keyboards, drinking fountains, you name it — that have been touched by hundreds upon hundreds of hands. Plus, if your local library is anything like ours, there’s probably a book or two floating around boasting some mighty mysterious stains. We wouldn’t recommend smuggling in a bottle of Lysol or completely avoiding libraries; just make sure that you remember to wash your hands thoroughly after a visit … and to return your books on time.