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The One-Way Speed of Light

How fast does light travel? Well, you might say the speed of light, but physicists have only ever measured the two-way speed of light, where light heads out and bounces back. But we have never measured the one-way speed of light and it could be between half "the speed of light" and infinity.


This is not a new insight! Einstein realised it in 1905! So why do so few scientists and students know this?



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