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Originally Posted by Halcyon
If yuo get a little capsule you get with Kinder eggs, fill it with baking powder and hot water, put the top on and shake it and throw it, it will explode in the air.
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Anyone old enough to remember the little plastic submarines you got in cereal packets. They had a small compartment underneath that you filled with baking powder, when placed in a bowl or the bath the sub would then rise and sink several times.