"People ask me how I do research for my science fiction. The answer is, I never do any research. I just enjoy reading the stuff, and some of it sticks in my mind and fits into the stories."
Time travelers would sometimes send themselves messages in the far future. They had to be kept someplace safe; you also need to make sure that they are not opened prematurely; that might cause a paradox.
It is an unusual package delivery system. The business model of most such systems is based on the shortness of the delivery time; this system is based on the length of the delivery time - sometimes many millennia. See also Time Capsule from the same novel.
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