We all know the importance of a few good, deep breaths. Even without knowing the science behind it, or practicing yoga (breath work in yoga is known as pranayama, literally "breath control"), we have all heard the conventional wisdom to take a deep breath when stressed, or before reacting to a triggering event. This is very good advice.
But did you know that if calm is what you're looking for, your exhale is important than the inhale? And that by controlling the length of your exhale, you can create calm?