In theory, today should be a boom era for carpooling. Gas is expensive. Millions of people want to reduce their carbon footprints. The average U.S. commuter now spends a total of 50.2 minutes per day commuting to and from work, and according to numerous studies, commuting makes us miserable. Yet according to a recent study, carpooling is only about half as popular now as it was when an upraised thumb was the only technology connecting drivers with passengers. Contributing Editor Greg Beato explains how ride-sharing apps and other game-like innovations can bring carpooling into the 21st century.