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The Elevator Is Always on Another Floor

The Elevator Is Always on Another Floor

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You press the elevator button, wait a few seconds, and press it again just in case. Why does it seem to arrive instantly when you do not need it and take forever when you are in a hurry? This chapter explores the mathematics of waiting and a counterintuitive idea: when arrival intervals are irregular, we are more likely to show up during the longer ones. Elevators, buses and trains reveal how the same average frequency can hide very different waiting experiences. Sometimes we are not unusually unlucky. We have simply arrived at random in a system where long intervals have more chances to find us.

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