Lfc, please first read my posting where i mentioned "...you NEVER know". i agree with you in some sense as i was saying the same thing. scientific communities, or you may prefer to read "scientific society", has a great role in the construction of the process. It provided lots of things during formulation of idea by Einstein, and tested the idea so many times. but, Einstein or his society did not construct that. he just tried to explain the truth or the phenomena. it may get refuted anytime in the future. But, NO NO NO NO CONSTRUCTION, IT EXISTS THERE. IT'S REAL.