relativity

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Ancient Web: Fourmilab Shows How to Bend Spacetime in the Basement

Fourmilab's Bending Spacetime in the Basement explains how a simple torsion balance can reveal the gravitational attraction between ordinary objects using the same basic principle behind Cavendish's classic experiment.

Ancient Web: Project GREAT Took Atomic Clocks on a Family Trip to Mount Rainier

Project GREAT 2005 turned gravitational time dilation into a family road experiment by taking cesium atomic clocks roughly 4,400 feet higher for about 42 hours and measuring a gain of around 22 nanoseconds.