This example combines a choropleth map and an animated scatter plot to explore country-level statistics. The map uses `d3.geoPath` with an Equal Earth projection to color countries by urban population rate, while the scatter plot encodes variables like life expectancy and birth rate. Users can switch axes between linear and log scales via `d3.scaleLog` and `d3.scaleLinear`, with transitions updating both axes and circle positions. Data comes from CSV and GeoJSON sources, with missing countries rendered in grey.