So many things have advanced, and advancing in many fields owing many things to technological advances. We can have class despite of thousands kilometers. We can telecommunicate everywhere in the world simultaneously. Nowadays, an operator in other continent can do difficult operations by using Robots. Though so many improvements in lots of field, we still need keen eyes of human being because machines don't have understanding about society and erros. =Though so many improvements in lots of field, we still need keen eyes of human being because machines don't have understanding about society and errors.  However we should forego many roles in many fields and will be replaced by machines.