Yeah, and I think it also refutes the common idea that you should "take a deep breath" when you're feeling stressed or when you begin to meditate. That doesn't help you actually, as some people think. Rather, the exhalation of a large amount of air through your mouth just de-oxygenizes your cells and your brain at a faster rate which is not good for you. And that happens when you sigh also.
Did you know THAT?
Did you know THAT?