Quote Originally Posted by Nicholas Lindan View Post
I once nearly bolted from my dentist's chair when he confessed he flunked calculus in college so many times they gave him a pass just to get rid of him - until it struck me that skill in dentistry really doesn't require calculus.
One definition of calculus: tartar

One definition of tartar: an incrustation on the teeth consisting of plaque that has become hardened by the deposition of mineral salts (as calcium carbonate)