"Compare Sports Drinks with the Electrolyte Challenge": in this chemistry project, students use a simple circuit and a homemade sensor to investigate the electrolytes in various sports drinks and juices.
Did you know you can make Plastic with Milk? (Science Experiment) (Living Life Intentionally)
Make a Photon Flower That Lights Up When you drop lemon juice on the zinc nails (covered w/paper toweling &wrapped w/copper wire or foil); LED completes the circuit. Stem & leaves are décor. From Instructables.