If you have a ballpoint pen, you might notice a small hole on the side of the pen. It’s called a vent hole. When you’re writing, you create a vacuum inside the pen. The hole allows air to escape so that you can easily write letters and numbers on the paper without the pen getting stuck to the paper. If there isn’t a hole, you might notice that there is a lack of ink while writing.
Look at the end of your toothpaste tube to see a small colored block. It could be red, green or blue. These indicate the ingredients that are in the toothpaste. Green is all natural, red features mostly chemicals and blue is natural plus medicine. When you look at your Apple earphones, you will likely see small holes. These allow air through the speakers of the earphones. It allows the diaphragm of the speaker to move more freely, giving a better sound.
There’s a small tab underneath the rear view mirror. This tab acts like sunglasses while you’re driving at night to block out the headlights of the car behind you, especially if the car has the high beams on and is blinding you while you’re driving. Look at the gaps in your tires to see how much tread you have left. Place a penny in the tread, and if you can see most of the penny, then it’s time to look for new tires as there is very little tread left. This could cause the tire to blow out while driving or make it easier to slide on the road.