He pointed a better eye at the sky and rolled bronze balls down planes until nature confessed the law of falling bodies.
He reduced falling apples and wheeling planets to one law — and demanded every cause be proved from the phenomena, or confessed unknown.
The naturalist who spent twenty years hunting objections to his own theory before he dared to publish it.
He gave up the perfect circle, six years of work, and a theory he loved, rather than dismiss an error of eight minutes of arc.