A device used on engines that uses a belt off the crankshaft to turn a pulley which turns fins mounted inside a casing. These fins increse pressure on the manifold side of the supercharger allowing more air into the cylinder on the intake stroke thus creating more horsepower.
While our lifespan is the number of years we will live, our healthspan is the number of healthy years we will have and our sexspan is is the number of years we will continue to be healthy enough to continue having an active sex life.