This interactive scatter plot visualizes COVID-19 impact on the US population, charting national rolling averages of cases and deaths over time since the pandemic began. Users can switch the y-axis metric between cases, deaths, and per-capita values via a dropdown menu built with D3’s dispatch system. The visualization uses d3.scaleTime and d3.scaleLinear to map dates and health indicators, with animated circle transitions handled through d3.transition. Data comes from the NY Times COVID-19 rolling averages dataset.