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Audio Video Interleaved Video  |  1996-07-06  |  10.0 MB  |  532x364  |  15fps  |  1 minute, 28 seconds
Transcription: In 1907, Einstein had what he called the happiest thought of his life, a thought that led to his general theory of relativity. The idea was simple, though the math is quite difficult. Imagine you're holding your pet terrier in one arm and a bathroom scale in the other. Then you step into an elevator Whoops! Though his mass is smaller, your dog would float next to you and you would not even register a pound on the bathroom scale. It would feel as if gravity had been suddenly switched off. This is the reason astronauts are weightless in space. They are falling around the Earth at the same rate t ...