Miss DeCarbo. All you need are clear cups, water, shaving cream, and food coloring. It was a HUGE hit with my kids. Oh, and it was also extremely motivating. Wednesday was our rough draft day for writing. Well, the kids and I discussed the fact that if they didn't work hard, they would miss out on the experiment. My kids that usually fight finishing up their paragraphs knocked them out in under twenty minutes. By the way, yes my name is on my paper. My kiddos have insisted the last few weeks that if they have to write their names, then I should have to write my name.
The only thing I would suggest is don't pile up the shaving cream REALLY high (I kind of did this) and make sure you put the food coloring towards the side so it runs down into the water quicker. Oh, and it is so much fun to let every kid make their own.
Have a great weekend!