I don't really have to do anything in particular with the afternoon class, which makes it really fun, but also challenging since I led high with the space rovers!! I don't want to let them down with something lame!
Finally, we made ice cream. You need to use a bowl fully 3 times as large as the amount of liquid you have. We used a pint of heavy cream, an individual serving of strawberry milk, 1/2 a cup of sugar, and 1t of vanilla (mainly so I'd have more jobs for kids). Before you start your experiments, place a 2-3 inch square of dry ice inside 2 heat duty Ziplock bags. DO NOT SEAL ALL THE WAY (remember that gas? they'll pop!). Then beat the dry ice until you have a very fine powder. Be diligent! You don't want a child biting down on a piece of dry ice! You'll make instant ice cream when you add the powder and stir. You'll notice I used too small of a bowl! The ice cream tastes a lot like an ice cream float because of the carbonation you're adding to it. The kids loved having a taste. I don't let them eat more than a spoonful each, but they enjoy the whole process!
To make these shirts, you insert a dixie cup under the top layer with the open side of the cup facing up. Place a rubber band around the cup, and then draw a design with sharpie markers. Designs with LESS area covered, like dots, stars, or small dashes, do the best. After you're done drawing, drop rubbing alcohol over the area (the cup catches the excess) using eye droppers or straws (put the straw in the cup, put your finger over the top opening of the straw, release over the shirt).