Crystal rock garden but in eggshells. Love the colors.
make your own ant farm!
Kid science experiments: inflatable balloon
100 Things To Do With Kids This Summer. There are some very good ideas in this list, many that I hadn't seen before.
23 science stations freebie...for a Family Science Night
Three Art Mediums for Three Types of Clouds
Botany Scavenger Hunt
Human Body: The Backbone (simple model)