I was e-mailed a great article from brain pickings and thought I'd share it. The link to the article also has a TED talks with Mandelbrot that is great if you have time to watch it.
"I prefer the word roughness to the word irregularity because irregularity — to someone who had Latin in my long-past youth — means the contrary of regularity. But it is not so. Regularity is the contrary of roughness because the basic aspect of the world is very rough.” ~ BenoĆ®t Mandelbrot