Tonight I’m going to start working on an idea I had for an interactive chart of NFL win percentages. The idea came to me when thinking about the Detroit Lions and how bad they are. I wondered if they had always been this bad or if it was only recently. (Hint: Always) So I thought it would be cool if I could look and see every team’s win percentage for each NFL season going back in time. This would be something easy to do in Excel or a static charting library, but I’m going to use it as an excuse to play with/learn an interactive data visualization library called D3.js. This is the javascript library that drives many of the webs coolest visualizations, like this New York times feature on NBA shot percentages. I’ll have to get it working first, but once I do I’ll be able to add interaction