This interactive visualization combines a choropleth map with a linked time-series histogram to explore global AI research publications from 1996 to 2022. The map colors countries by publication totals using a sequential blue scale, with bubble sizes reflecting aggregated output for a selected year range. Users can brush the time-series chart to filter the map, dynamically recomputing summed data across years. Built with React and D3 v5, the example uses `geoNaturalEarth1` and `geoPath` for map projections, `scaleSequential` with `interpolateBlues` for coloring, and `brushX` for interactive selection, with data sourced from a CSV and world-atlas TopoJSON.