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Laughing Gas
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He He He
Explanation
Helium is a noble gas and is denoted by the symbol He. He He He is the sound of laughter.
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<a href="https://www.chemistryjokes.com/jokes/laughing-gas/" title="Laughing Gas" target="_blank"><img src="https://www.chemistryjokes.com/images/laughing-gas.jpg" title="Laughing Gas" alt="Laughing Gas" /></a>
(18 votes, average: 4.72 out of 5)
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