Other types of Calculus

Alternate 1

A concentration, usually of mineral salts, around organic material found especially in hollow organs or ducts.

This is an X-ray of what a Calculus looks like

Alternate 2

A graphittied bovine: Cow-culus

MOOOOOve over math. There's a new cow in town, much better than the udders, whose gonna milk this cash cow for all it's worth.