Have you ever wondered why there is a whole and the notched thing at the end of a tape measure? Me neither but both are actually very useful. I wish I new these things like 30 years ago.
I also found out that I am ripping Post It notes off the pad the wrong way, why there are rivets on your blue jeans, what the bumps on the F & J keys on a key board are for too. And what about that little tiny thing between the camera and the flash on your iPhone.
tape measure photo: getty images