To start with, imagine a world where people can choose their appearence. That itself in science means altering and redesigning genes . It may sound interesting and compelling, but we do not know the consequences of that experiment. For instance when a mother gives birth to her baby, she can also choose if her child will be tall, blonde with blue eyes. Another example is the longevity. Scientists try to discover a way which can help us to live longer. Personally, I am strongly opposed to altering genes. At first, all may be perfect but as the years will pass the overpopulation will grow because of the longivity. Also if we start changing ourselves by making them look like models, all the world will be monotonous.