Spark plugs are integral components for gas-powered internal combustion engines. These diminutive devices create the electric spark that ignites the fuel and air mixture inside your motor.

If there is an advantage to any of these plugs, it's that it won't cost much to discover if they work for you. The new AC RapidFire plug is probably the most unusual of the specialty plugs.

If your dry eyes itch, burn, or sting, punctal plugs may be just the thing to relieve your symptoms. How well they work depends on what causes your problems and what kind of plug you and your ...