As part of her advice to the graduating fifth grade class years ago, the principal of my younger daughter's elementary school said "If you open something, close it." I immediately remembered a scene in a movie in which Tina Fey comes around a corner and rams into drawers left open by husband Steve Carell. All my life, I have closed any drawers or cupboard doors I opened. It was automatic, but when someone else in the family began leaving them open, I started doing the same sometimes, a vexing corruption of habit that then required me to consciously remind myself to close them.
What the principal didn't have time to go into is that, in a house, there are doors to purposely leave open, and doors to keep closed.
In our house, the doors of the refrigerator are immediately closed, of course, but the doors of a second refrigerator, unused and unplugged to save energy, need to remain open a crack. It looks funny and is counterintuitive, but if left closed, the anaerobic bacteria, which thrive in warm places where the air can't reach, will take over inside the unused frig and cause a stink.