There has been a very big progress in technology during the last century and there are all kind of devices out there. There have been many kind of inventions like, for example, various motors. Some of them are brushless servo motors, but there are also many other. What I find interesting is that there has been such a big progress in technology in such a short amount of time. How is it possible, one might ask? I think it is possible, because people spend a lot of time studying various things and it is inevitable that they make interesting discoveries many in the process.