This reusable D3 scatter plot displays rolling-average COVID-19 deaths in the United States from New York Times data, with each circle representing a daily average. The chart uses `scaleTime` and `scaleLinear` to map dates and death averages, while `axisBottom` and `axisLeft` render labeled axes. It layers multiple bottom axes for months and years, and includes annotations marking a vaccination milestone and source attribution. The code follows the reusable chart pattern from Bostock’s “Towards Reusable Charts,” exposing width, height, data, and radius as accessor properties. Data loads via `d3.csv` from the NYT GitHub repository into an SVG rendered across the full viewport.