Every human being has approximately 200 different types of cells that join together in millions and form the different tissues and organs. Some tissues specialise in support functions as the bone, cartilage and the connective tissue.

Others develop movement capability as muscles and others become specialised in the elaboration of information and its transmission as the nervous cells.

Human evolution has required a very long time to create what we are today from the early forms of life that populated Earth.

Time spans that seem eternal to us are just moments in evolutionary time.

As an example in the last 50,000 years human beings remained biologically identical. 30,000 years ago mankind populated already great part of the planet and only 10,000 years ago human beings changed from the nomadic life of the hunter to the stable one of the farmer.