According to new research out of Clemson University, bicycling correlates with joy. For one thing, people who choose to bike tend to be pretty enthusiastic about their wheels. Plus, bikers are usually relatively healthy, which is a trait that many happy people possess. Car passengers come next on the happiness scale, followed by car drivers (presumably because they actually have to deal with traffic and can’t play Candy Crush or take a nap). Bus and train riders fall on the moodier side of the scale—probably because mass transit is disproportionately how people get to work, which rarely puts anyone in high spirits.