A Tongue Battery
    An object that is charged with static electricity is not a steady source of electrical current.  When it is grounded, the charge quickly disappears.  Wouldn't it be nice if we could store up electricity so that we could get it when we want it?  Guess what?  We can! Electricity is stored in batteries.
    You can make a battery with your tongue.  You will need a piece of aluminum foil and something silver, such as a piece of jewelry or a silver fork.  Taste the aluminum foil.  Now taste the silver.  Nothing happens.  Touch the foil and the silver.  Put your tongue at the place where the silver and foil meet.  You'll feel a tingling.  Electricity flows in a circle from one metal to the other through the saliva on your tongue and back to the metals.  The key to a battery is very simple--you need two different metals and a liquid called an electrolyte that conducts electricity.  Saliva is a very weak electrolyte.  Acids and salt water are also electrolytes.

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