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@SDAFS56788141 @1st_Reduce_Harm @ChipWhitehouse @Rainmaker1973 https://t.co/iVcH45IXT3 https://t.co/ubCyfmeEjn https://t.co/g3KEtECgaw So the first is for the Zinc world hypothesis, second is the iron-sulphur world hypothesis and the third is Nasa's rep