This visualization shows a scatterplot of GDP per capita against life expectancy for the top 50 most populous countries in 2002, with circle size encoding population. The code uses D3.js and React, rendering SVG elements via a custom Scatterplot class. Data loads from a CSV file using `d3.csv`, and the chart uses `d3.scaleLinear` for x, y, and radius scales, with axes generated by `d3.axisBottom` and `d3.axisLeft`. A year slider is present in the HTML but is not yet connected to data updates.