I thought I’d mention this, even though it’s irrelevant to this weblog, because you gotta know about it: in Utah 15 years ago they detected a cosmic ray—a fast-moving proton—that hit the earth or rather upper atmosphere with a kinetic energy equal to that of a well-thrown baseball. To pack that kind of wallop it had to be going at almost the speed of light, where “almost” means that in a year a beam of light would have outrun it by only 2 millionths of an inch. Since then a number of similar events have been noted. Apparently a ray with that kind of energy hits an average square mile on the earth’s surface every 50 years or so. Astronauts and sunbathers take note.