Clocks are around us

When I was thinking about the theme of the post my view fall to the clock on the shelf. It is a simple round clock with a mechanic alarm function. I've remembered there are many kinds of clocks in history. Probably. the first clock in history was the sun in day and moon and stars at night. The prehistoric people used them to split time into parts and to have the possibility to say when something was or will, to coordinate their activity.
Then, people invented the clock. Somebody thought down to mark the tree shadow on the ground to mark the different periods of time. So the sun clock was invented. Then in different countries and different ages were invented many kinds of clocks. There were solar, water, fire, sand, mechanical, electrical, and even nuclear. The inventing of the clock let humankind add more regulating to their life.

Nowadays clocks are everywhere. They are on the people's hands and almost in each device, you can view them in the streets and on public transport vehicles. Many people have many clocks. They wear it on the hand, usually on the left wrist, but there are some individuals who wear clocks on both hands simultaneously. Clocks are in each mobile phone, laptop and tablet. Clocks may be as a simple device as a luxury one at a huge price.