A classic 6th-grade science experiment. Using ice and salt to freeze a milk, sugar, and food coloring mixture demonstrates freezing point depression without needing a freezer. The salt lowers the ice's temperature below 0°F, pulling heat from the milk mixture to freeze it into soft ice cream. 

Kids love it because they shake bags for 5–10 minutes (great energy burner), eat the results, and learn a tangible concept about states of matter and heat transfer. Food coloring makes it colorful and fun for observations.

Water Filtration Experiment: Students will design and test their own water filter using a choice of materials: cotton, pebbles, sand, rice, coffee filter, paper towel, or charcoal - to clean dirty water.