The tiny sacks of life
You have two lungs that you use to breathe. Each lung is a stretchy sack, kind of like a balloon, but not empty like a balloon. Inside your lung are millions and millions and millions of tiny sacks called
Back to sighing
Here's the thing about the tiny sacks called alveoli: you have so many of them that, actually, you don't need to use them all at once. When you are sitting quietly, you can get move enough gas by using just
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