Annalogies are great way to bring a difficult subject down to earth.When I discuss long and short rod theories I bring up 2 dogs I used to have,one a very large (long legged)or long rod, and a very small dog (short legged)or short rod. I threw a bone in the back yard & the small dog bolted in front of the big dog.A few moments later the large dog took over and got the bone first.The same way short rods have bottom end power over long rods.And long rods have the top end power over short.