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==Origin of lithium==
Minutes after the Big Bang, the universe was made almost entirely of hydrogen and helium, with trace amounts of lithium and beryllium, and negligibly small abundances of all heavier elements.<ref name="habitable"/><ref>{{cite web|url=https://physics.unc.edu/the-cosmological-lithium-problem/|title=Cosmological lithium problem|website=University of North Carolina}}</ref>
===Lithium synthesis in the Big Bang===
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