Robots for educational use in schools and components and sub-assemblies for use with the robots, sold with the robots [ ; mobile robot kits comprised of radio control components, plastic casings, charge receptacles, servos, wheels, linkages, spacers, casters, threaded nuts, screws, collars, washers, and threaded rods; stationary robot kits comprised of servos, extension cords, interface boxes, interface box software, gear motors, pulleys, plastic casings, spacers, bearings, flangettes, pincer...