Everyone knows bowling balls are for knocking things down. But it turns out they're also pretty good at shoring up our knowledge of basic physics. Just have a look at this strangely hypnotic YouTube video showing a line of bowling balls on strings swinging back and forth like pendulums.
At the start of the "Pendulum Wave Demonstration" video, which was posted on Sept. 7 by YouTube user Maria Ikenberry, the balls swing side by side. But slowly they drift out of phase to form a wavelike pattern--because the strings that hold them are of different lengths and thus cause the balls to s...
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