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Your correspondence on quantum mechanics (Editorial, 30 August; Letters, 3 September) reminded me of a conversation that I had 50 years ago with a German biologist. He told me that as a teenager he had wanted to be a theoretical physicist and went to a lecture by Wolfgang Pauli on the latters exclusion principle. Seeking out Pauli at the end, he said: That was wonderful, I could see exactly what you meant. Paulis reply: If you could see it, you didnt get it. I gathered that was why he chose biology.Prof John GallowayCroxley Green, Hertfordshire

Richard Walker (Letters, 3 September) is right about the brilliant Crossroads TV theme. Ive always felt that some programmes were more popular than they deserved to be purely because of their theme tune. An obvious candidate was the 1970s detective series Van der Valk, whose excellent theme tune, Eye Level, seemed to raise it above the average.Dougie MitchellEdinburgh

Re weather forecasts (Letters, 2 September), I was reminded of the words of a visiting American acquaintance in the 1980s. Im not sure why you Brits bother with weather forecasts, he said. There are only three states of weather in the UK: its just stopped raining, its raining, or its just about to rain.Ray WoodhamsBarnsley, South Yorkshire

Simon Jenkins says the Afghan war cost Britain 37bn (Biden isnt the first president to promise never to wage another war of intervention, 3 September). That is the same amount that Boris Johnson allocated to NHS test and trace (provided by private companies). Astonishing. Jeanne WarrenOxford

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Just when you think youve got physics - The Guardian