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The greatest problem for mathematicians now is probably the Riemann Hypothesis.
"Books are mirrors: you only see in them what you already have inside you."
The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all. And that, of course, causes great confusion.
Without forgetting it is quite impossible to live at all.
Quality should never be compromised for the sake of short-term profits.