Traces the intervention downstream and forward in time — who is exposed, what accumulates, who decided — before anyone calls it safe.
He pointed a better eye at the sky and rolled bronze balls down planes until nature confessed the law of falling bodies.
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.