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Sandrine Ceurstemont, New Scientist TV Think it's easy to determine if something is moving? Since position and velocity are relative, it's not always obvious. But when scientists discovered that the speed of light is absolute, it became even more confusing to explain how anything else could move . In our latest One-Minute Physics episode, animator Henry Reich illustrates how Einstein's special theory of relativity changed our understanding of physics.
New Scientist TV: One-Minute Physics archive
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