9 Hidden Features Of Everyday Things Most People Don’t Know About [With Pictures]

2. The Hole In Airplane Windows

9 Hidden Features Of Everyday Things You Probably Didn’t Know 7

If you’ve flown on a plane before and sat close to the window, you will notice there is a small hole in the plastic glass covering the windows. That hole is meant to allow air to flow into the plane and also to regulate the pressure in the plane.

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