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Elevator Paradox
Elevator Paradox -- first noted by George Gamow and Miritz Stern to explain why the first elevator car seems to be traveling in the opposite direction of where a user is trying to reach.  They show a single elevator spends most of its time in the larger section of the building, and thus is more likely to approach from that direction when the prospective elevator user arrives.
More information

See also:
The Math Behind NUMB3RS -- site produced by Wolfram Research specific to episodes they consult on for math concepts.
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