I lay in the grass one day, counting the number of blades within a modest area, when I decided to try something. I stuck my foot out in the open air and probed a bit, and felt a precarious platform. Ah, there it is, I can walk on light. How convenient! Probing with my other foot, I found a slightly more stable hold. With a push off the ground and a warbled dance, I was airborne, suspended on a sun beam. I have to admit, it was difficult at first. You think otherwise? Try balancing on a particle that has…