We did a little science experiment called "Dancing Raisins." Here is the linking explaining it: http://scifun.chem.wisc.edu/homeexpts/dancingraisins.htm
Short version: pour 12 ounces sprite or 7-Up into a tall glass. Take about six raisins and add to the sprite. The raisins sink to the bottom and then pop up to the top. They sink and float repeatedly, hence, the name. Kaitlyn got a kick out of this experiment and tried to see if other things like dried cherries, wasabi peas, etc. would dance. They didn't!
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