I’m sure many of you have flown in an aeroplane before, as have millions of people around the world. My wife and I are in transit as I write this in fact. We’re hopping on and off at airports, trying to get back home, seeing the same two strange phenomena over and over again. The first occurs a few minutes after touching down, while the second needs a half hour more or so. I’m sure you’ve all seen this happen and perhaps you even do this yourselves – perhaps you’ll be able to enlighten me as to why it happens.