Any attempt to simplify one part of an equation causes the rest of the equation to expand such that ugliness is conserved.
The law is of course not literally true, or simplification would be impossible. It is merely an expression of frustration in those cases where simplification proves difficult when dealing with large or complex equations.
The law is named for professor Schultz (physics) of the College of DuPage.
Where's your conversion van if you're a religious cult bent on converting? A minivan isn't spacious enough to get anything done to some asshole with a death wish.
The Law of Conservation of Ass states that women can be changed from one attitude into another, ethnicity combinations can be separated or made, and pure females can be corrupted, but the total amount of ass remains constant.
On Earth the amount of ass remains constant as women gain ass as much as they loose.
IE; a women gets a flat ass when she gives birth to a girl with a large ass, thus upholding the Law of Conservation of Ass.