The boys have recently been very interested in Volcanoes, so we decided to make one. It only took a few minutes, but they are still talking about it. We went into the corner of our back lot and made a small mountain with a glass bottle in the center. I know the Baking Soda Vinegar trick, but googled it to see if we might get a bigger explosion. With warm water and dish soap the reaction almost doubles and the boys were so impressed. We also added red food and a whole bottle of Vinegar. The next time I go to the Commissary I will pick up a couple of bottles, we'll see just how big of an eruption we can get.