It’s not everyone’s favorite topic but researchers at Harvard are really into mucus. Most of us think of mucus as going hand-in-glove with cold and flu season. In some ways that’s true. We usually have an increase in infections during the winter because there are more of us inside and in smaller spaces than usual. That makes it easier for us to exchange germs. If you take preventative measures and build up your immune health, you’ll find that you breeze ...