By the age of 23, he had laid the foundations for calculus, the laws of gravity, motion and inertia, and begun experiments on light. His major work is called 'The Principia'. Isaac Newton has been called the Father of Modern Science. His incredible body of work represents arguably the greatest contribution to science ever made by an individual. But despite living at the vibrant center of an inspired social scene, his personal life was marked by loneliness. Examine the many discoveries and private fears of this remarkable man.