This book is dedicated to my parents. To my father, Robert, who even after 40-plus years as a junior high mathematics teacher and computer instructor, has a love of teaching. He has shown me a real commitment to sharing knowledge with others. To my mother, Beverly, who was my first editor, coaching me through elementary school papers on this state or that president. She taught me the value of sticking with a job and seeing it through to the end. I owe them both a debt of love, caring, and support that can never be adequately repaid.