Empty Again.

A physicist, a biologist, and a mathematician are sitting in a café and notice people going into and coming out of the house across the street. First they see two people going into the house. Time passes. After a while, they notice three persons coming out of the house.

The physicist: “The measurement was not accurate.”

The biologist: “They have reproduced.”

The mathematician: “If one person enters the house, then it will be empty again.”

From: Eric’s favourite Math jokes

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