Icy road experiment w/ sand & salt
Exploding bags with baking soda and vinegar-science lesson. They take off like rockets!--kids would love this
Science Project for Kids: This is a egg after it has sat in vinegar for three weeks. It swells and you can see the parts of a cell.
25 cool science projects to try at home with your kids
Weather: Fill the cup with water. Put shaving cream on top for a cloud. Explain that when clouds get really heavy with water, it rains! Then put blue food coloring on top of the cloud, and watch it rain.