Two linked D3.js v6 visualizations explore the global distribution and endangerment status of languages. A world map uses `d3.geoPath` with an equal-earth projection to plot each language as a point, colored by its degree of endangerment. A connected scatterplot uses a log scale for speaker counts, with a `d3.brush` selection that highlights matching language points on both charts simultaneously. The data comes from a CSV of language statistics joined with a GeoJSON world map.