This visualization plots cumulative confirmed COVID-19 cases from a Johns Hopkins time-series dataset as orange circles on a world map. Each circle’s radius encodes the case count for March 25, 2020, using a square-root scale. The map is drawn with `d3.geoMercator` projections and TopoJSON country features, while the data is loaded via `d3.csv` and rendered as SVG circles via `d3.scaleSqrt`.