By profession I am an architect. Often when designing cottages there is a talk about insulation of facades. All the employers are trying to convince me that insulation should be done from the inside of the premises. I prove, according to what I was taught, that on the outside, using a bunch of professional terms such as the depth of freezing, the point of rose, the bridge of cold, etc... After several attempts, I prove my right, but not with little blood and force of conviction.



Recently my cousin Vitalik approached me for advice on the same issue. I came with my wife. They were sitting and listening for a long time, Vitalik couldn’t say, “Why then all that?” and then his wife couldn’t stand (see, a smart woman, even noticed) and gave the following answer:



When it’s cold, do you swallow your jacket or wear it on top?