As a percussion tool, hammer occupies a place in the toolbox. Although it is often inconspicuous, in fact, in its countless strokes, human beings have come all the way from the barbarian era to the present. About 2 million years ago, human ancestors would hold stones as beating tools to live or fight, which is the earliest origin of hammers.

More than 30000 years ago, human beings began to tie beaten stones to wooden sticks to make stone hammers. This is the first version of hammers with handles. The hammer handle is more convenient to force, and the lever composed of hand and hammer handle can amplify the hitting force, so that the hitting force and speed of the hammer can be greatly improved.

Source: @barackus_le