When arriving home the other day, I met a neighbour who was having problems opening the front door to the building. "The lock's broken again", she complained. Actually, it wasn't. She just had been turning the key in the wrong direction. For two minutes.
I, too, sometimes forget which way to turn the key. Fortunately, there are only two possible ways. As part of their work, theoretical physicists have to deal with rotations in many dimensions of mind-bogglingly complex mathematical structures, like E8. So perhaps I wouldn't do too well at theoretical physics.
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