| http://www.w3.org/ns/prov#value | - Light's speed, Einstein forcefully declared, is 300,000 kilometres per second relative to anything: http://www.sciencedirect.com/science/article/pii/S0262407913605655 Trouble with physics: The roots of reality, Brian Greene: In the late 1800s, when James Clerk Maxwell realised that light was an electromagnetic wave, his equations showed that light's speed should be about 300,000 kilometres per s
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