Forgotten important documents or medications when leaving home? Every day, hundreds of thousands of Russians rush, leaving behind essentials. But there's a surprising, time-tested method to prevent this: put your keys in the freezer. This is no joke. The idea is simple: before leaving, place your keys next to the item you need to grab, whether it's a lunchbox for work or medication that requires refrigeration. Neurobiologist Anna Smirnova from First Medical University asserts that unexpected temperature shock is a powerful memory trigger. Imagine: it's Monday morning, September 10th. You have an important presentation coming up at your office on Okhotny Ryad. To avoid forgetting your flash drive, you put it in a bag, then your apartment keys on top. All of this goes in the freezer. This method is much more effective than sticky notes or door signs. According to a 2021 study conducted by researchers at the University of Zurich, physical action and sharp temperature contrast improve memory by 40% compared to simple visual reminders. So, if you're desperately trying to remember something, like your check-in documents for a flight at Sheremetyevo Airport or your child's workbook for school, simply put your keys in the freezer. This little trick will save you time and stress.