Have you ever wondered about the mystical powers of superheroes when they push at each other with some kind of invisible force? The movies depict it as blue or green lines (sometimes red). The hero increases the power and pushes the villain backward. Then the villain turns it up a notch, and the hero nearly falls. The battle would look the same if each participant used a pressure washer. Instead of swirling colors, it would be a high pressure stream of water. When my teenage