This interactive choropleth map visualizes global brain and central nervous system cancer deaths for the year 2019, colored using a yellow-to-red sequential scale. Built with React and D3 v7, it uses `d3.geoPath` and `d3.geoNaturalEarth1` for map projection, while `d3.csv` loads the data appended to a TopoJSON world atlas. A legend and hover tooltip, implemented with `d3.select`, show the total death counts per country.