"Sweet spot." Golfers understand the term. So do tennis players. Ever swung a baseball bat or paddled a Ping-Pong ball? If so, you know the oh-so-nice feel of the sweet spot. Life in the sweet spot rolls like the downhill side of a downwind bike ride. But you don't have to swing a bat or a club to know this. What engineers give sports equipment, God gave you.A zone, a region, a life... (more)