This book contains a series of physics lessons on some essential subjects: atoms, basic physics, the relations between physics and other scientific fields, energy, gravitation, the world of quanta, the symmetrical character of physics laws, restricted relativity, space-time, and general relativity. Feynman's lessons remain a model for physics teachers everywhere. Written in a lively, powerful manner, they are clear and incisive and go straight to the point. In order to help readers gain an intuitive understanding of each situation, the author often makes comparisons drawn from every-day life, while asking profound questions about the world we live in. Because Feynman was so deeply imbued with the aesthetic dimension of physics, his lessons attempt to show that the real object of physics is to unveil the beauties of the world. Richard Feynman (1918-1988) taught at the California Institute of Technology. He obtained the Nobel Prize for Physics, in 1965.