If I have seen farther than others, it is because I have stood
on the shoulders of giants.
Newton, referring to Galileo
Even as great and skeptical a genius as Galileo was unable to
make much progress on the causes of motion. It was not until a gen-
eration later that Isaac Newton (1642-1727) was able to attack the
problem successfully. In many ways, Newton’s personality was the
Newton had to be coaxed by his friends into publishing a book on
his physical discoveries. Where Galileo’s writing had been popular
and dramatic, Newton originated the stilted, impersonal style that
most people think is standard for scienti c writing. (Scienti c jour-
nals today encourage a less ponderous style, and papers are often
written in the rst person.) Galileo’s talent for arousing animos-
ity among the rich and powerful was matched by Newton’s skill at
making himself a popular visitor at court. Galileo narrowly escaped
being burned at the stake, while Newton had the good fortune of be-
ing on the winning side of the revolution that replaced King James
II with William and Mary of Orange, leading to a lucrative post
running the English royal mint.
Newton discovered the relationship between force and motion,
and revolutionized our view of the universe by showing that the
same physical laws applied to all matter, whether living or nonliv-
ing, on or o of our planet’s surface. His book on force and motion,
the Mathematical Principles of Natural Philosophy, was un-
contradicted by experiment for 200 years, but his other main work,
Optics, was on the wrong track, asserting that light was composed
of particles rather than waves. Newton was also an avid alchemist,
a fact that modern scientists would like to forget.