BOOK CLUB. I have heard some enthusiastic talk about The Dangerous Book for Boys. Apparently it teaches lads how to make bows and arrows and slingshots, and the Ten Commandments. Sounds like ripping fun. I wonder how it's doing in Washington Heights? I rode my bike up to Fort Washington Park this past weekend, and there saw young fellows playfully trying to hit each other with their fists, while others played baseball with a small toy soccer ball and a tree branch. What these youngsters need, I found myself thinking, are some bows and arrows and slingshots. Also the Ten Commandments, or at least