In the 21st century, humans have become well-acquainted with not only the concept but also the practical reality of robots. In fact, robots have become a very real concern for many workers throughout the industrialized world as ever advancing technology threatens to replace them. But while we live in an age where robots are becoming commonplace, it was not too long ago that they were the subject of only myth and legend. The Sumerians, Chinese, Egyptians, Greeks and Indus Valley civilization have a multitude of accounts concerning robots and automata in general.