This scatterplot visualizes the number of plays per person against their active days on the EdX platform for the 2013 academic year, with a color legend identifying courses by viewer name. Built with React and D3 v5, it renders SVG circles positioned by `scaleLinear` scales for the x and y axes, while a sequential `scaleOrdinal` color scale encodes the categorical player names. The chart includes interactive hover highlighting that fades non-selected marks to 20% opacity, and it loads CSV data from a GitHub gist derived from the MITx-HarvardX Dataverse.