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Science - People Watching
A Mathematician, a Biologist and an Engineer are sitting in a street cafe watching people entering and leaving the house across the street.
First they see two people going into the house. Time passes. After a while they notice three people coming out of the house.
The Engineer says: "We didn't collect an adequate baseline sample."
The Biologist concludes: "They have reproduced."
The Mathematician says: "Look! Someone else is about to enter--and then it'll be empty again!"