Films, laminates and articles comprising a fluoropolymer that contains amino-reactive functional groups only after activation are made antimicrobial by activating the fluoropolymer surface and then contacting the activated surface with a solution comprising chitosan. The engine includes multiple cylinders, each with at least one electrically actuated valve, and the engine operates in a first mode having a first number of firing cylinders and a second mode having a second number of firing cylinders. 64 inches; and a cover comprising a polyurea formed from a polyisocyanate, a polyamine, and a curing agent; wherein the ball has a compression of between about 50 and about 120. The game playing software determines at predetermined intervals the relative performance of players playing a game, based on competition skill, which forms the basis for determining winners, and participants in future competitions. Preferably, a plurality of motion signal values is generated from the received plurality of motion signals, and force filtering includes the step of applying a force filter matrix to the plurality of motion signal values to produce a force filtered motion signal value.