Why did we invent the screw?
The screw was made to help make work easier. Screws are made of a pole and an inclined plane with a pointy bottom and a top. Screws help people in many ways. You could find a screw in many different things and you might not even notice! Here are two different things that have screws in them: machines like pencil sharpeners and jar lids too. Just think. If we didn't have screws, almost everything in the world would fall apart! Too bad they didn't have screws a million years ago. Some people even think about how hard life would be if we didn't have simple machines.