avings in the use of copper. (1999) Possibility of external fertilization or artificial womb. ( 2001 ) Widespread use of heart transplant from human being by resolving problems such as transplant immunity, rejection and donor. ( 200 1) Practical use of rapid-transit railway using iron rail and iron wheel, which can run at 300 km/h. (2006) Development of artificial ear. (2007) The combined realizat