CAMBRIDGE, Mass. – Walter H.G. Lewin, 71, a physics professor, has long had a cult following at MIT. Now, he has emerged as an international Internet guru, thanks to the global classroom the institute ...

Jerrold R. Zacharias developed the first commercial atomic clock, made advances in radar systems, and helped build the first atomic bomb at Los Alamos during World War II. The adoption of atomic time ...

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Walter Lewin is an author, an astrophysicist and a professor of physics at Massachusetts Institute of Technology (MIT), who might be most famous for his eccentric lectures (which you can access online ...

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 ...