It’s tax day. And if you haven’t done so already, it’s your last chance to fill out your income tax forms and make a payment to the IRS. It’s a time-honored tradition. It’s a civic duty. It’s a pain. And we all have to do it. But how much do we really know about how our tax money gets used? To help taxpaying Americans visualize just how exactly our tax dollars get spent, Google launched a challenge for engineers and designers to come up with a website that best lays it all out. We talk with the winner of the Data Visualization Challenge, Anil Kandangath, who created the website, Where Did My Tax Dollars Go?