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- Jul 9, 2003
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Mind blown.Check this out—a chap named Fizeau measured the speed of light 176 years ago with this toothed wheel setup! The gear he used, spinning to chop up light beams and bounce them over miles—absolute genius!
The video of a wheel with 720 teeth, whirring at speed, and a mirror 8.6 kilometers away to clock the light zipping back. 1849, and he got it to 313,000 km/s—pretty darn close to today’s number!