1. Wear a mask. 3. Sanitize. Itâs sound science and delivered with effective psychology, following the so-called ârule of threeâ principle that suggests humans remember information effectively in patterns of three. But hereâs the danger of advice that can be remembered almost mindlessly: You still have to think; you have to apply it to situations. Here in Western New York, with snow totals rising and temperatures dropping, that means making the science work indoors. Heading into Christmas and the new year, this installment of âPandemic Lessonsâ brings you advice from top scientists on how to keep your indoor spaces safe: