Janet B. Pascal is an Executive Production Editor at Viking Children's Books and the author of Who Was Dr. Seuss?, Who Was Maurice Sendak?, Who Was Abraham Lincoln?, and What Is the Panama Canal?

Isaac Newton was always a loner, preferring to spend his time contemplating the mysteries of the universe. When the plague broke out in London in 1665 he was forced to return home from college. It was during this period of so much death, that Newton gave life to some of the most important theories in modern science, including gravity and the laws of motion.