Colds run rampant in the winter because we spend more time in cramped quarters (buses, classrooms, hockey change rooms, couches and ski chalets) and less time outside. Viruses pass from our hands to others, and via the air after a sneeze or a cough. It’s not always easy when the weather’s really crisp, but cold prevention can be as easy as choosing to go on a walk instead of going to a movie theatre. When you can’t avoid close quarters, give those hands a good wash with soap and water. Also, some studies indicate that humidity and the rhinovirus don’t get along, so using a humidifier might help fend off colds.