A dynamic scatterplot tracks the spread of COVID-19 across Hubei, China, from January to February 2020. Each circle represents a prefecture-level city, positioned by cumulative confirmed cases (x-axis) and newly confirmed cases (y-axis), both using a logarithmic scale. An animation cycles through daily snapshots, updating the data bound to each circle via D3's data join and `transition`. The visualization uses `d3.csv` to load the data and `d3.scaleLinear` for the axes, with circles colored by region and rendered as SVG within React.