A physicist, a biologist and a mathematician are sitting in a street cafe opposite an empty house. They see two people go into the house. Time passes, and after a while they see three people walk out of the house.
The physicist says "The measurements were not accurate."
The biologist says "The people who went into the house have reproduced."
The mathematician says "Now, if exactly one person enters the house it will be empty again."
A mathematician, physicist, and an engineer are asked to find the volume of a red sphere:
The mathematician looks at the sphere and then measures the circumference and then calculates the radius and uses that to calculate the volume.
The physicist looks at the sphere and then gets a graduated cylinder and fills it part way with water. He then submerges the sphere in the water and states that the volume of the sphere is equal to the displacement of the water.
The engineer takes the sphere and starts look at it all over, making sure that he sees the whole surface of the sphere. Then he pulls out a book of tables and starts flipping through it. He starts to get nervous as he nears the end of the book. When he finishes with the book, he pulls out another book of tables and keeps flipping through it. When he finishes with his second book he asks "Hey, do any of you have tables for red spheres?"
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