Have you heard the news? Astronomers have observed the early phase of an exploding star. It’s 2008d, the “ supernova caught in the act .” If you are in the science media, you can’t help having heard about it. For days, we’ve been in the midst of a blitz that would make the Luftwaffe envious. Fortunately, the supernova discoverers are firing press releases at us, not dropping bombs. At one point yesterday, I almost reached for my spam filter. As is...