This scatter plot visualizes worldwide GDP versus population for 1980, with each circle representing a country and tooltips revealing GDP per capita. The code loads CSV data from a GitHub gist using D3 v7’s `csv` loader, then renders an SVG with `scaleLinear`, `axisLeft`, and `axisBottom`. Axis ticks are formatted via a custom `numMaker` utility that converts large numbers into abbreviated units (e.g., “B” for billions). Circle tooltips use D3’s `title` element, driven by React-free DOM selection and data joins.