I was looking over howstuffworks.com and i saw a link to "how a light saber works." It wasnt perfected but it made me realize that every scientific endeavor is based upon someone's imagination. If history was different, science would be as well. This is not because perhaps atomic energy would be made 50 years earlier or later, but possibly not at all. When someone wraps their head around something, a new science is born. Who could know the infinite number of things humans will never encounter because these facets were never born in someone's mind. theres just something amazing about how real things come to be, its not progression, its someone's insane idea which eventually finds an explanation.