Maxwell's Wheel is an addictive desk ornament. Roll the axle upwards until the strings are completely wound and then let go. The wheel rises and falls, using the cables for support, until the kinetic energy is lost to friction and the wheel falls still.
The momentum of the wheel and principles of conserving energy, means that the wheel will continue to spin for just under a minute.
Named after Scottish theoretical physicist, James Clerk Maxwell, this scientific instrument is great for offices, studies and classrooms.