The speed of light was once thought to be infinite and able to travel over infinite distances instantaneously. The polymath Galileo Galilei thought this to be wrong and had an assistant stand atop a hilltop 1 kilometer away from him. Galilei shone a lantern and had the assistant shine one back as soon as he recognized the opposing lantern being lit. Galilei proposed that he could measure the reaction time divided by the distance. The experiment failed to work because a much greater distance woul...
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