Einstein is full of common sense, yet it is he that wrote that common sense was ‘the collection of prejudices acquired by age eighteen’. Absolutely correct. No good whatever to science, or for that matter to religion. But important for living a life. And with an almost uncanny accuracy Einstein points to the age of 18. Because it is around this point in life, precisely, that those who are never going to acquire common sense exhibit the fact most tragically. They become seriously ill and risk ending their lives. Consider what happens in this well-known condition in which, most obviously, common
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