Ask professors about important physics lectures, and they'll probably point you toward Richard Feynman's famous 1964 talks. They led to one of the most popular physics books ever (over 1.5 million ...

For the past four minutes, Walter Lewin has been laboring at the chalkboard, bent on conveying a point—or rather, a series of small, swift points, so close together they resemble a perforation. The 76 ...