Scientists demonstrate how time can pass at different speeds.

To demonstrate the effect of Einstein's relativity theory in an ordinary setting, scientists at the National Institute of Standards and Technology, Colorado used two extremely precise atomic clocks and placed them on steel tables in neighboring labs, with a 75-meter-long optical cable connecting both the clocks to compare their timekeeping. In the two experiments that followed, scientists were able to show the relativistic affects on both the devices.

Wired reports on their findings:

In the first experiment, physicist James Chin-wen Chou and his colleagues at NIST used a hydraulic jack to raise one of the tables 33 centimeters, or about a foot. Sure enough, the lower clock ran slower than the elevated one — at the rate of a 90-billionth of a second in 79 years. In a second experiment the team applied an electric field to one clock, sending the aluminum ion moving back and forth. As predicted, the moving clock ran slower than the clock that was at rest.

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