This bubble chart visualizes the number of boba shops across California cities, with each circle’s area encoding the count. Circles start at the center and are arranged by a force simulation using `d3.forceSimulation`, including center, charge, and collide forces to prevent overlap. Users can drag circles, which temporarily fixes their position, and hover to see a tooltip with the city name and count via mouse events. The chart is rendered as SVG using D3 v7, with color from `d3.scaleOrdinal(d3.schemeSet3)`, and loads data from a CSV file.