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===About Fuel Cells===
: In a '''fuel cell''' [[Oxygen]] is combined with [[Hydrogen]] to produce [[Water]].
: '''Fuel cells''' are designed to combine [[Hydrogen Ion(Chemistry)|Hydrogen ions]] and [[Hydroxide Ion|Hydroxide ions]] to produce a [[Potential Difference|potential difference]] between two [[electrode]]s.
: '''Fuel cells''' may be used in electric cars and were used on the Space Shuttle.