We've got preconceived ides about any number of things. Most of those ideas are learned and taught. I got to thinking this evening that those who changed preconceived ideas of their time thought for themselves and in the course of doing so changed history. Textbooks were rewritten. Commonly held beliefs had to be rethought. Consider what Edison said about failing for example. Each fail wasn't failure at all but brought him closer to his goal because with each attempt that didn't work he learned how not to do it. Of course Tesla was much more of a dreamer than Edison (yet they were both dreamers) but even Tesla held the same positive belief that failure wasn't failure but a mere part of the process needed to eliminate that which wouldn't work in order to achieve that which would. As for me, I'd much rather fail at everything I attempt knowing that at least I tried, instead of sitting in front of a TV or an Xbox or some other dumb downed thing not even trying to better humankind.