He reduced falling apples and wheeling planets to one law — and demanded every cause be proved from the phenomena, or confessed unknown.
He pointed a better eye at the sky and rolled bronze balls down planes until nature confessed the law of falling bodies.
Builds a small imaginary experiment, finds the assumption nobody noticed — then spends thirty years refusing to give one up.
The naturalist who spent twenty years hunting objections to his own theory before he dared to publish it.