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It's not a joke. That's true.

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You're not gonna tell me your grandpa never did marry your grandma because you stick your flashlight into the washmachine well I guess that if lightwaves went back in time by spinning a flashlight, the effect would be minimum. Else you would see a flash on the wall before you even rotated the lamp! I swear I never saw that happen. Even if you would spin a flashlight around near the speed of light, I doubt you would see a flash a few seconds before the machine starts spinning.

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Nope. The fact is that measurement is a form of information hence you can't measure a FTL signal. You know it's there, but you can't touch it in a sense.

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