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Chaos Corner
Numberphile
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Comments by "Chaos Corner" (@chaos.corner) on "Cones are MESSED UP - Numberphile" video.
Old joke: If z is the radius and a the height then the volume of a pizza is Pizza
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You could also use two liquids. This might lead to other possibilities. Like if you shook it up, you might be able to confuse someone as to which was which because of the time to settle out.
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