"What purpose is served by showing that England's greatest natural philosopher is flawed ... like other mortals?" asks one of the characters in Newton's Darkness. "We need unsullied heroes " But what if the hero is sullied? At stake is an issue that is as germane today as it was 300 years ago: a scientist's ethics must not be divorced from scientific accomplishments. There is probably no other scientist of whom so many biographies and other historical...