{"version":"1.0","type":"rich","title":"Aggregation by Country + Dropdown","description":"This visualization displays the number of video views for HarvardX/MITx online courses in 2013, with circles sized by view count on a world map. A dropdown menu filters the displayed data by course. The map uses a Mercator projection via `geoMercator` and `geoPath`, with geographic features from the World Atlas TopoJSON. View data comes from a CSV file loaded with `d3.csv`. The visualization is built with React components and D3 scales (`scaleSqrt`) for circle sizing.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/b4ed8151dd954559b37235d70dd95d05?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}