"You may not have the grades, the money or even the means to get to a physics class with one of the Massachusetts Institute of Technology's best lecturers.But if you have an Internet connection anywhere in the world, you can watch a video of the Dutch-born physics professor, Walter Lewin, swinging on a cable across the front of a lecture hall in his "Classical Mechanics" course to demonstrate that weight doesn't affect the time it takes a pendulum to complete a cycle of motion. And you can do this for free."
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