A Physicist, a Biologist, and a Mathematician are observing a building.
A very portly man in distinctive black turtle neck sweater and jeans enters. About an hour later two skinny men, in matching black turtle neck sweaters and jeans leave.
The Physicist says "Within reasonable experimental error, the conservation of mass has been demonstrated."
The Biologist says "We've perhaps seen some sort of composite Mitosis of a complex organism."
The Mathematician says "You know, if one more guy goes in there that building will be empty!"
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