Learn about Einstein's theory of relativity from a Nobel Prize-winning physicist and one of the greatest minds of the twentieth century in six memorable lessons. It was Richard Feynman's extraordinary and captivating teaching method that earned him legendary status among students and professors of physics. From 1961 to 1963, Feynman delivered a series of lectures at the California Institute of Technology that revolutionized the teaching of physics. In "Six Not-So-Easy Pieces," drawn from these famous Lectures on Physics, Feynman delves into one of the most revolutionary discoveries in twentieth-century physics: Einstein's theory of relativity. The idea that the flow of time is not a constant, that the mass of an object depends on its speed, and that the speed of light is constant regardless of the observer's motion initially shocked both scientists and laypeople. However, as Feynman demonstrates, these tricky ideas are not just dry physical principles but things of beauty and elegance. No one— not even Einstein himself— explained these difficult, counterintuitive concepts more clearly or with more flair and enthusiasm than Feynman. Filled with wonderful examples and clever illustrations, "Six Not-So-Easy Pieces" is the ideal introduction to the fundamentals of physics from one of the most admired and accessible physicists of all time. There is no better explanation for the scientifically literate layperson.