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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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