           So why another JavaScript visualization library?
                Charts can always be made with a template engine, by directly manipulating the DOM
                with the raw <a href="https://www.w3.org/DOM/">W3C DOM JavaScript API</a>, or by using a
                library such as <a href="http://jquery.com">JQuery</a>.
                But, we don't want to have to re-invent the wheel every time.
                The <a href="http://d3js.org">D3</a> (Data-Driven Documents) library is a powerful