They used only themselves.
true but machines hurt people when people dont use machines properly
They use machines so people don't have to work as hard.
The two reasons why people use simple machines are because they make things easier to pull and lift.
It is not known who specifically invented the roller ball bearing. There are examples of their use by the ancient Egyptians. However, it is thought that they may have been invented before the wheel.
he invented them he didn't improve them,before there was something else(sorry i have forgot the name) but he was the 1 who invented dynamites.
They didn't. You can't use something BEFORE it is invented.
benches
pickaxes
bikes
Buttons.
carriages
horses or their feet.
Buttons and knots.
they use to walk
wall sockets
Brief case
We used letters.