‘Gresham’s Law,’ said my husband unkindly, possessing himself of the zapper and hopping between channels quite unnecessarily. I had just asked him the difference between an irrational number and a transcendental number.
‘Gresham’s Law’ is his shorthand for: ‘Something you don’t understand.’ It is true that in the past every time I have asked, ‘What does Gresham’s Law mean?’ my husband has said, ‘Ah, you don’t understand.’

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