As much as we would like to ask the orchestra conductor or theater director why they interpreted Beethoven or Tennessee Williams in a particular way, the opportunity to query them personally doesn’t often happen except in a lecture. I’ve seen plenty of bad speakers who are up there fulfilling their own needs instead of the needs of the people they are presenting to. I met William Gurstelle , author of Backyard Ballistics , at FOO Camp , an event run by O’Reilly Media . It was a big thrill since I’d gotten much pleasure from the  fun, love of learning,