Ever wonder what makes people right or left handed. Scientist don’t have a definite answer but most think 1/2 of the brain is more developed that the other side. The left side controls the right side of the body and vice versa. This size difference controls which had is dominate. If the brain is equally developed a person may be ambidextrous of use both hands equally. When the right hand is dominate it is normally larger then the left because the muscles are more developed.