An excellent Friday crossword, lots of ingenious and crisply crafted clues. Exhibit A, 39D, Long divisions?, AISLES, and 52A, They may have lots of steps, STAIRWELLS (a nice bit of indirection). Today's puzzle was also, as all good crosswords are, a learning experience: 5A, First country to discover water on the moon, INDIA; 11D, Many a farmer's market attendee, LOCAVORE (wow!); and 30A, "Rabbits" in a race, PACESETTERS, which forms the basis of today's Fun Fact Friday segment.