Fact sheet.First published: Analog, July 1971.
Download full text from Baen Books.
Among the stories edited by John Campbell for Astounding/Analog.
Related: Stories of James H Schmitz.
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Trying to figure out science fiction
11:30 pm in this clock (that's 6 pm GMT).
The clock shows India time (IST). Note India doesn't have any concept of daylight saving time; so if your locale has it, the relative posting time will appear to have changed with your time change.