A linked-view dashboard displays country life expectancy across time, combining a colored equal-earth map with a matching scatter plot. A slider updates both views for a selected year, while hovering over a map region or scatter point highlights its counterpart in the other panel and shows a tooltip with details. The visualization uses d3.geoPath for map rendering, d3.scaleLinear for color encoding, and SVG elements for both the map and circles, with animated transitions driven by D3 v6 event handlers.