21. That little tiny hole in your iPhone next to your camera.
Have you even noticed that it was there?
Well, it is a microphone. It turns out that the new iphones have about 5 microphones on them.
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22. Those buttons on your plastic lid.
No, those are not braille for blind people!
Those buttons are actually to help you identify what kind of soda you have.
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23. The shape of your beer bottle.
The neck of the beer bottle has a two-fold use.
The first use is pretty obvious, it makes it easier to hold. The second is to help keep the beer cold even when you are holding it.
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