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TIL that fraction of deuterium in hydrogen in e.g. water depends on location and source of water (lake, ocean, precipitation): https://en.m.wikipedia.org/wiki/Hydrogen_isotope_biogeochemistry
TIL that fraction of deuterium in hydrogen in e.g. water depends on location and source of water (lake, ocean, precipitation): https://en.m.wikipedia.org/wiki/Hydrogen_isotope_biogeochemistry