Einstein: 'You know, Henri, I once studied mathematics, but I gave
it up for physics.'
Poincare: Oh, really, Albert, why is that?'
Einstein: 'Because although I could tell the true statements from
the false, I just couldn't tell which facts were the
important ones'.
Poincare:'That is very interesting, Albert, because, I originally
studied physics, but left the field for mathematics.'
Einstein: 'Really, why?'
Poincare: 'Because I couldn't tell which of the important facts were
true.'