I just made a black background. And you can download it at, let me write it right here, at khanacademy.org slash downloads. And actually if you just do that, you'll see all of the downloads, I haven't put it there yet, I'm going to do it right after I record the video. This downloads slash normal distribution. Normal distribution. That's distribution.xls. If you just go up to khanacademy.org slash downloads slash, you'll see all of the things there.