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.
Get the answers about 11 ordinary things that are actually really useful here
tape measure photo: getty images