I would make a science joke but all the good ones ARGON.
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One day, a young boy was asked by his teacher to tell him what the chemical formula for water was. The boy replied with "H-I-J-K-L-M-N-O". The Teacher was stunned. "That's not right, how did you come up with that?" The boy said, "Last week you said it was H2O!"
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Did you hear about the homosexual electron? Went around blowing fuses.
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Chuck Norris can make same magnet polarities stick together.
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Whats the chemical formula of compressed liquid oxygen? O2.zip
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