The Sweet Spot In Time

The Sweet Spot in TimeAs a kid, I spent a lot of time throwing rocks. The best place to do it was under a bridge, where there were always plenty of rocks and bottles--targets as well as missiles. You set up the bottles on one mudbank, then crossed over to the other side and you were in your own private shooting gallery. It was the only childhood activity I knew that ever involved anything like a warm-up. You would start out just lobbing the rocks, gradually working up the pace ("velocity,&q...