Chlorine
From Tardis Wiki, the free Doctor Who reference
Chlorine was an element on the periodic table. (PROSE: Elementary, My Dear Sheila)
The Sixth Doctor despaired when Flip Jackson mentioned that chlorine was "invented". It was used in swimming pools. (AUDIO: The Behemoth)
Señor 105's Chlorine Room had a swimming pool. (PROSE: Elementary, My Dear Sheila)
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