You have been using these things your whole life, yet you never knew their true purpose. All is revealed...
That indentation at the bottom of your wine bottle is for relieving the pressure while the bottle is being corked. Champagne bottles have a larger indent.
There is a small hole on the back of iPhones. That, believe it or not, is a microphone.
There are hooks on the charging cable, but a lot of people get confused as to why they're actually there. They are meant to make wrapping easier.
A lot of women have been using bobby pins wrong their whole lives. You're actually supposed to put the flat side on top.
That little hole on the Pan handle is there for a specific reason. You can hang the pot with it, or you can leave your spoon there for less hassle.
The fuel gauge has a neat feature not many people know about. The arrow points to which side the the fuel hatch is on the car.
Rivets were invented long ago by the first jean companies. They were designed to add extra toughness by adding metal to places where people tend to rip or scrape their jeans against things.