Book excerpt: What makes these 72 crosswords, from The New York Sun, the best ever? They’re carefully edited so those obscure words that nobody actually uses are out, and solving pleasure is in, thanks to tricky clues and witty puns. Most of the puzzles have clever and original themes that add to the fun. (The title hints at the topic.) Plus, solvers will enjoy the wide range of difficulty, which is indicated by the number of stars on top.