Mentos and Soda Bottle Rockets. Adam had a great time figuring this experiment out. He and Jon taped mint Mentos to the inside of the bottle lid and slowly put the lid on the bottle. You then shake it really good until you can feel the presure inside the bottle. Throw it up in the air and when it hits the ground it shoots back up into the air about 50 feet. The 7up doesn't work. The Diet Pepsi worked and so did the Dr. Pepper. It was concluded that the citric acid does not cause the presure needed. It was a lot of fun. 
As you can see, when you don't follow the instruction of taping the Mentos to the lid, you don't have time to put the lid on an throw it. Brian got half the bottle sprayed on him.
More pictures tell a great story.
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