Hank: Have you ever noticed that flying makes you a little gassy? Don't worry, that's not just you. This is a real, scientifically-described phenomenon.

HAFE, or "High Altitude Flatus Expulsion," is the term - the real term - that researchers use for the increasing urge to fart as you climb in altitude. And isn't it great that it happens in an airplane, which is just a closed tube with a lot of people in it.

It's explained by Boyle's Law, one of the fundamental principles of gasses, which states that the product of a gas' pressure and volume remains constant. And as your altitude increases, there is less atmospheric pressure acting on the gasses inside your body - yes, all of them - which means that the volume of the gasses increases, and you either have to let them out or endure the pain o holding them in the entire flight. Don't do that!

So next time you take to the skies, just know that you are not the only one feeling the pressure.

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