What makes s person become right-handed rather than left-handedness? As yet, no one really knows for sure. One simple idea suggest that people normally get right-handedness from their parents. Studies have found that two right-handed parents have only a 9.5 percent chance of having a child, whereas two left-handed parent have a 26 percent chance of having a left-handed child. Another common theoty is that left-handed people suffer mild brain damage during birth, Which makes them left handed. However, if this theory were true, it would not explain why the percentagw of left-handed people is sosimilar in every society, when birthconditions vary so much from society to society