Newton Would Know This

C.S. and I were in a bookstore the other day. I picked up a trivia book and flipped to the sports section, whereupon the following exchange took place:

J.G.: Okay, here's one. (reading aloud) "In baseball pitching, which direction does a curveball curve?"

C.S.: Well, um, it depends . . . .

J.G.: Nope! Says here it curves down.

C.S. (bristling): They all curve down after you throw them!