grabastic

    // Less
    .rounded-corners (@radius: 5px) {
        -webkit-border-radius: @radius;
        -moz-border-radius: @radius;
        -ms-border-radius: @radius;
        -o-border-radius: @radius;
        border-radius: @radius;
    }

    // Sass + Compass
    .rounded-corners {
        // All vendor prefixes are generated for you
        @include border-radius(5px); 
    }

  1) I need a data visualization library.
  2) D3 seems to be a good one.
  3) Read the D3 docs at the project's homepage.
  4) I still need help learning D3.
  5) Google for tutorials.
  6) End up at this person's tutorial.

    root.selectAll('rect')
            .data(rects).enter()
        .attr({
            x: function (d) { return d.x; },
            y: function (d) { return d.y; },
            width: function (d) { d.w; }
        });