We are in a constitutional crisis. It is not a looming crisis. It has already arrived, with the president’s declaration that he has the absolute right to pardon himself and his potential partners in crime, and the absolute right to stop any investigation for whatever reason he chooses.

What if gravity suddenly stopped working? Or what if e gradually came to equal mc3 rather than mc2? Could the fundamentals of physics really change? Or Is this just the stuff of science fiction?