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.