This example presents a survey-driven data visualization of terrorist attack death tolls in Europe from 2015 to 2020. After users submit their guesses via sliders, the results phase renders an animated SVG bubble chart where circle size and color encode death counts, plotted against year on the x-axis and deaths on the y-axis. The visualization uses React for state management, d3.v7's `scaleLinear`, `selection.join`, and `.transition().ease()` for animated updates, with data loaded from CSV. Interactive features include tooltips on hover and clickable bubbles.