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Neil deGrasse Tyson @neiltyson
FYI: All terrestrial Helium comes from hydrogen fusion in reactors & the radioactive decay of heavy elements in Earth's crust — PolitiTweet.org
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Thu Nov 24 16:31:03 +0000 2011
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Likely AvailableNeil deGrasse Tyson @neiltyson
FYI: All terrestrial Helium comes from hydrogen fusion in reactors & the radioactive decay of heavy elements in Earth's crust — PolitiTweet.org