But the crazy thing about empty space, weighing something --[well,] there are many crazy things — it produces a gravitational repulsion, rather than the attractions so the expansion of the universe is speeding up; but this
stuff is so
mysterious and inexplicable — completely inexplicable right now — that many physicists have been driven wild and mad and have changed what we might mean by fundamental physics by suggesting, for example, that the fundamental concepts in nature are not really fundamental at all, they are accidental; they are an environmental accident; that the are many universes and we just
happen to live in the one that has the values it does because if you changed it a little bit then we wouldn't be living.
First - time visitors go to the plate glass door on the main street, but true Nismoheads know that it's behind the
mysterious red door down the side street where the good
stuff happens.