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A Mathematician, a Physicist, and an Engineer were sitting on a park bench when a red ball came to rest in front of them.
The Mathematician says, "If we measure the diameter of the ball, we can get it's volume by 4/3pi(d/2)^3..."
The Pysicist chimes in, "...or simply submerse it in water and measure the volume of water displaced."
The Engineer looked dumbfounded and said, "Why not just look it up in the Red Ball Book?"
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