Day and night (and sometimes the rest of the time)

It happens (although very rarely, I don’t even know whether it is worth mentioning it) that I don’t reply within the next 5 minutes. You will find some possible explanations here

When a discussion is obviously necessary

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It also happens, though about once every other century, that I don’t call back within the next 5 minutes. Some possible explanations are here

Do not look for a cellular phone: up to now I have survived without !