Digital Millionaires not only exist, they are created every day. Most have made their fortunes not by creating apps, games, or new social networks-things out of reach for the average person-but by creating and selling online educational programs on topics as common as baking, starting a business, losing weight, dating advice, even how to juggle!

Dan Henry is one of those Digital Millionaires. He went from barely being able to pay his electric to an 8-figure earner by selling his advice online.

This book is the blueprint on how to start, grow, and scale an online education business-skipping the trial and error. In this book, you'll discover how you can duplicate his success and turn your knowledge into a profitable online business by joining the multi-billion-dollar e-learning industry.

Engineering Experiment Station Series, No. 47. Foreword By E. B. Norris. Includes Calculation Of The Elastic Curve Of A Helical Compression Spring, By H. C. Keysor; Helix Warping In Helical Compression Springs, By D. H. Pletta And F. J. Maher; Load-Deflection Characteristics Of Helical Springs, By D. H. Pletta And F. J. Maher.

Perturbation of the boundary is a rather neglected topic in the study of PDEs for two main reasons. First, on the surface it appears trivial, merely a change of variables and an application of the chain rule. Second, carrying out such a change of variables frequently results in long and difficult calculations. In this book, first published in 2005, the author carefully discusses a calculus that allows the computational morass to be bypassed, and he goes on to develop more general forms of standard theorems, which help answer a wide range of problems involving boundary perturbations. Many examples are presented to demonstrate the usefulness of the author's approach, while on the other hand many tantalizing open questions remain. Anyone whose research involves PDEs will find something of interest in this book.