The Winter 2016 edition of Golf Teaching Pro magazine will feature an article titled “The Innovation Factor.” Here is an excerpt: There’s an old saying, “The only constant is change.” This is certainly no truer than in the world of golf. When the game originated, the ball used was made out of wood. That eventually gave way to the featherie, then the gutta-percha ball, then the wound ball, and finally to today’s solid-core ball with multi-layers. Golf clubs have also undergone their own transformation, with mere sticks being replaced by more sophisticated all-wood clubs with a honed shaft, followed by metal and wood clubheads attached to a hickory shaft, with steel and then graphite shafts following. Irons went from a muscleback design to perimeter weighting, complete with multi-material construction.