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Slightly off-topic, but this reminded me of a story my mathematics teacher told me once.
It was about how the allied forces used the serial number of captured german tanks (or planes, I'm not sure) to estimate how many they actually had.
So, we could apply the same trick to find out how many readers are out there.
If some other people can post the serial number of their reader we can estimate the number of readers out there.
Assuming the readers are numbered sequentially, if we can get N serial numbers and M is the highest reported serial number, then the estimated number of readers is (M-1)(N+1)/N.
(IIRC, maybe I should brush up on my probability and statistics knowledge)
So for now the estimate would be that there are 51926 readers out there.
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