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Thin and Thick disk metallicities overlap, but alpha(Fe) relations differ;there is also a hiatus in time before the first thin-disk stars, with a minimummetallicity [Fe/H] = -0.6. Thus there are two `G-dwarf' problems. We fitmetallicity distribution functions (MDFs) for the two disks derived by Wyse &Gilmore (1995) with analytical models (for O and Mg). The Thick disk fits asimple inflow model with effective yield and final [Mg/H] about the same as forthe Thin Disk, excluding continuous mass loss from the former as a source ofprompt initial enrichment (PIE) for the latter. The Thin disk has a narrow MDFfitted (rather poorly) with a closed model having PIE from some other source,or more elegantly with a slow infall model similar to the `two-inflow' scenarioof Matteucci et al., but with a PIE and a severe break in the age-metallicityrelation. Implications for radio-active cosmochronology are investigated.Comment: World Scientific LaTeX, 6 pages, 4 Postscript figures To appear in  `Cosmic Evolution' Conference at IAp, Paris, honoring Jean Audouze and Jim  Truran, 13-17 Nov 200

CHEMICAL EVOLUTION OF THE GALAXY: THE G-DWARF PROBLEM AND RADIOACTIVE CHRONOLOGY REVISITED TAKING ACCOUNT OF THE THICK DISK