Conciousness, though to be a manager you need no conscience.
But, machine tools?
Good blacksmithing moved us a long way forward and was a vital component of civilisation and the advance of civilisation for far longer than machine tools have been around.
I guess it depends on perspective.
Most kids might argue that the answer is "gameboy" or "playstation" and in the papers yesterday it was reported that addiction to playstations has become a recognised medical condition.
Gee, I guess it's Sunday and I have nothing better to do. Well I will have when the wife catches up with me.... now what did Tnboy82 say was "the one thing" we needed?