But it was all worth it. The students were amazed by their own personal tornadoes in a bottle. Here is my grandson Peter. His bottle NEVER leaked. It survived him and my gran daughter and NEVER once leaked. That is because we don't have white carpet. Only the bottles that went home to white carpets leaked (joke)... The children love these things. The parents can't wait till they disappear. Here is a suggestion I gave to one mom today. She wanted to "dispose" of the tornado but was afraid that her daughter would be horrified. I told her to just keep moving it closer to the garage each day. After about a month she could put it right next to the trash can and then sneak it into the can and her daughter would never notice! If you have a better way please post your comment.