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Constraints: binary neutron star merger rate from gravitational waves ($\\sim 10\\text{ to }1700\\,\\mathrm{Gpc}^{-3}\\,\\mathrm{yr}^{-1}$), ejecta per event ($\\sim 0.01\\text{ to }0.05\\,M_{\\mathrm{sun}}$), the $[\\mathrm{Eu}/\\mathrm{Fe}]$ versus $[\\mathrm{Fe}/\\mathrm{H}]$ trend and its scatter in metal-poor stars, and Pu-244 in deep-sea crusts. Answer: fractions with uncertainties.","problem_ref":"2b0d5d2ed8e499603637f1fc0a3ee48b7ad5d64e04786e66086c6d908745ec96","references":"","settled_by":"A tighter merger rate and kilonova yield sample from gravitational-wave events, together with direct detection of r-process signatures from collapsars.","status_note":"2025: delayed MeV emission after the 2004 SGR 1806-20 giant flare was interpreted as radioactive decay of about $10^{-6}\\,M_{\\mathrm{sun}}$ of fresh r-process matter, adding magnetar flares as a minor site.","title":"Which site dominates the r-process inventory of the Milky 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