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A comment on We may not be running out of helium after all (2015). Parent comment
https://www.wolframalpha.com/input/?i=(.3++438000+TWh+%2F+year)+%2F+(17.59+MeV)+%2F+(avogadro%27s+number+1%2Fmol)++(4.002602+g%2Fmol)
(.3 * 438000 TWh / year) / (17.59 MeV) / (avogadro's number 1/mol) * (4.002602 g/mol)
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https://www.wolframalpha.com/input/?i=(.3++438000+TWh+%2F+year)+%2F+(17.59+MeV)+%2F+(avogadro%27s+number+1%2Fmol)++(4.002602+g%2Fmol)