time measuring device

Unlike the popular pendulum clock 200 years ago, inventor William Congreve's clock measured time by the movement of a small ball.

The idea of ​​measuring time only appeared about 5,000-6,000 years ago when people began settling down and building civilizations. Before that, time was divided into two concepts,

The watch was created by only one type of atom in the atom that scientists thought was not simpler.