Nonlinear systems abound. The mathematician
Stanislaw Ulam is reputed to have once said that
referring to nonlinear systems as natural is like 
referring to the bulk of the animal kingdom as "non-
elephant animals."

The study of nonlinear systems is like the study of non-elephant biology.

Quantity is no substitute for quality, but it's the only one I've got.

FIX:
A person that has achieved grace is like a swan gliding across the water.
Its motion appears effortless because you do not see its feet...always
running.

When you have lost sight of your goals, the only thing that makes sense
is to double your efforts.

A mathematician is a device for turning coffee into theorems.
-Paul Erdos

What is to give light must endure burning.
		-Viktor Frankl