It is by logic we prove, it is by intuition that we invent. — Henri Poincare [to the tiny minority of fellow 40+ HWers] Intuition comes from being open to it,

It is by logic we prove, it is by intuition that we invent. — Henri Poincare [to the tiny minority of fellow 40+ HWers] Intuition comes from being open to it, which comes from doing new things. I'm sure that as we get older, there is some decrease in mental flexibility and energy - but a big part of it is a choice to be less daring, less open. By analogy: it seems inevitable that old age means loss of bone density. But a study gave some menopausal women weight training - yielding dramatic (50%) increase in bone density. Use it or lose it.