This video studies a set of twins and documents their growth and progression as time goes on. The set of twin boys are identical but one is noticeably larger than the other. They relate this size difference back to when twins are growing in the womb and one takes up more space to grow. This malnourished twin will be delayed in most of his development after birth. However, eventually environment will overthrow the initial traits from birth and growth will be determined by physical activity, food, and nurture from the parents. This also explains changes in identical twins overtime. Although their DNA match at birth, environment changes not only a children psychologically but also physically.