Quotes About Doorstops

On L. Ron Hubbard: Now I must admit that "Battlefield Earth" is a book with something for everyone, all the way across the cultural scale from people who need doorstops to people who want to start bonfires.

Calculus is the mathematics of change. It describes everything from the spread of epidemics to the zigs and zags of a well-thrown curveball. The subject is gargantuan—and so are its textbooks. Many exceed a thousand pages and work nicely as doorstops.