Years ago, when my kids were younger, I took my family to the Ringling Brothers and Barnum & Bailey Circus. It was billed as the “Greatest Show on Earth,” and it certainly lived up to its name. We had seats front and center, so the whole spectacle was laid out before our eyes. The children in the audience weren’t the only ones oohing and aahing at the grand performance. The adults were amazed, too. All the regular elements were part of the show. The ringmaster led the events with his booming voice. The clowns made us laugh with their silly antics. The dancers entertained us with their choreographed routines. But it was the skill of the acrobats that really made an impression on me. At one point, a group of them climbed poles whose tops swayed in the rafters far above the floor. The performers weren’t attached to safety lines, nor was a net stretched below them to break a fall. Apparently unbothered by this, the acrobats scampered up the pole to a tiny platform, where they did handstands on even hung by their feet. One slip and they would have been in big trouble. Yet they seemed perfectly at…