A biologist, a physicist and a mathematician were sitting in a street cafe watching the crowd. Across the street they saw a man and a woman entering a building. Ten minutes they reappeared together with a third person.
"They have multiplied," said the biologist.
"The original measurement wasn't accurate," the physicist sighed.
"If exactly one person enters the building now, it will be empty again," the mathematician concluded.
Editors note: Had there been an engineer present, he probably would have asked how they built a new model so quickly.
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