A scatter plot of 2007 Gapminder data shows life expectancy against GDP per capita, with circle size encoding population and color encoding continent. Hovering over a point reveals a tooltip with its country name, GDP, and life expectancy. The visualization uses D3 scales and an SVG Voronoi overlay to detect mouse position and trigger tooltips. Voronoi cells are computed with `Delaunay.from` and `voronoi.renderCell`.