This interactive histogram visualizes the Iris dataset, allowing users to explore the distribution of any two flower measurements via dropdown menus. The chart displays overlapping colored bars for each species, with circles marking bin boundaries and midpoints. Built with React and D3 v7, it uses `d3.bin` for histogram generation, `scaleLinear` for axes, and renders SVG elements. Data loads from a CSV file containing sepal and petal dimensions for three iris species.