Dry ice in a bowl with some water = "witches brew" and at least 30 minutes of the kids sitting around the bowl shrieking watching the water "boil" and hiss and give off vapor.
After going to a Space Time Kids thing at our local library all about our solar system and space travel, we came home and followed the simple directions the enthusiastic teacher had shown us and made our very own alkaseltzer powered rockets. This is such a great project since the kids could actually do most of it on their own using cardstock, high tech bonding agent (elmer's glue), and high teck binding ageng (tape). I got empty 35mm film canisters from Walgreen for the "Engine compartement" in the bottom of each rocket and we were off to the launch pad (aka a garbage bag on the living room floor until we realized these suckers blasted off so high they hit our ceiling...then it was outside!)
Finally, we did a simple experiment with whole milk, soap and food coloring to make cool "fireworks" in the milk and learn a little bit about surface tension and equilibrium...and messes (not that we need any help with that!) They loved it and it cracked me up at the end when we had a murky soapy mess of milk and I said "okay now who wants to drink this?" and they all went "me me me!" Silly boys...
Of course, this is all in addition to the usual running around in underwear tackling each other, eating blackberries by the Costco sized clamshell, and watching Sports Center non-stop. But we try to break up the monotony and that's what counts!
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