Some are pretty obvious, but others you may never have heard of. The functions of some everyday objects is fascinating.

This bulge at the bottom of wine bottles is used to equalize pressure when the cork goes into the bottle. Champagne bottles have a larger indentation.

On the back of the iPhones are small holes - these are the microphones

These little hooks on charging cables are to help you pack up the cable easier.

Many women use these things wrong - the flat side has to go up.

These little holes are there for a reason. You use them to hang the pot or stick the spoon in.

A nice little feature is the arrow on the fuel gauge. In case you ever forget which side the gas cap is on.

These rivets were invented a long time ago by the first jeans manufacturers. They should make the jeans more robust because there is often heavy wear at these places.