| 11. | Think of it as commuting to work at the speed of light.
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| 12. | Experiments suggest that this speed is the speed of light in vacuum.
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| 13. | One of these anomalies involved a controversy over the speed of light.
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| 14. | One possible explanation is variation in the speed of light, he said.
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| 15. | Different physicists have attempted to measure the speed of light throughout history.
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| 16. | A velocity is then expressed as fraction of the speed of light.
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| 17. | It also does not preserve the speed of light c between frames.
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| 18. | What about the speed of light in " natural units "?
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| 19. | "They process trends at the speed of light, " she said.
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| 20. | Q . How do we know how fast the speed of light is?
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