Why is learning abacus a must while calculator is available for computing numbers?

Learning Abacus is a must for every child it is not just to do calculation, it is instrumental in developing whole brain and lifetime skills. Using Abacus requires co-ordination of the main nerves of the human body such as sight, sound and finger movement which will induce growth of brain cells. Most of the population are right-handed and right-handed people normally have more developed left brain. While creativity side of the right brain is more than a thousand times than that of the left brain. Learning abacus will stimulate the development of the right brain at an early stage.