A decade ago I lost 100 pounds. I did it in my web-nerd way—by building a custom content management system using the Django framework in the Python programming language. Every day I would enter calories ingested, calories expended through exercise, my weight, and whatever thoughts occurred to me. It became a job. I produced charts and compared the results of different kinds of exercise. I put it all online at OHLIH.com, which stood for One Huge Lesson in Humility.