This is a video guide that accompanies Modern Marvels Soft Drinks. I use something like this when I need a break or if I have a sub. There are approximately 30 questions that go in order with the video. Modern Marvels videos can be found on the History Channel or the videos can be purchased online. I found this video on amazon at this link. (It actually sells for $16.95 on amazon.): http://www.amazon.com/Modern-Marvels-Drinks-History-Channel/dp/B004QNVQXC
These videos are perfect when you have a substitute because the videos last about 45 minutes.