Brushing a time-series histogram filters a world map of migrant disappearance incidents, with circles sized by the square-root-scaled death toll. The React app uses `d3.geoNaturalEarth1`, `d3.geoPath`, and `d3.geoGraticule` for map projections, while `d3.scaleTime`, `d3.histogram`, and `d3.brushX` handle temporal binning and selection. Data comes from a CSV of Missing Migrants records, rendered as SVG with `useMemo` to cache computations.