A perfectly constructed highly complex, intertwined story line with the elements of perfect execution. Finding fracture in the script is nearly impossible. The best thing about the series is to put an early, but very necessary, brilliant ending to the story, no unnecessary elongation is performed, to make the excellence in execution remain same through the whole package. In the end, this untieable knot is a golden creation of its time. And realizing the scientific concepts used in the construction after the whole experience is nothing short of a discovery.