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Any method of sending [information] that has to account for the freaky rules of Einstein's relativity, where the [order of events] can be subjective and nothing can outrace light. It's not about FTL; it's about dealing with the mind-bending fact that due to time dilation and the relativity of simultaneity, "now" for you isn't "now" for someone moving at a different speed. This makes syncing up conversations across [interstellar] distances or near light-speed ships a total headache.
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