{"version":"1.0","type":"rich","title":"EdX Viewership Map, 2013","description":"A world map displays the geographic distribution of video views in HarvardX and MITx online courses for 2013. Each circle’s radius encodes the total number of views at its location, with a tooltip revealing the exact country and view count on hover. The visualization uses a Mercator projection through `d3.geoPath` and `d3.geoMercator`, rendering land and graticules from the world-atlas TopoJSON. Data points, loaded via `d3.csv` from a GitHub Gist, use `d3.scaleSqrt` to map view counts to radius, all drawn as SVG marks within a React component.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/852b82a2b3294cf48eb99e3291991bfd?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}