This experimental version of the hand warmer is offered as a test idea and not as a definitive solution. You’re encouraged to share your science fair results online. Click above to get the experiment details!
Materials 1 cup sand tbsp cornstarch 1 tsp dish soap water (as needed) Optional* Food coloring Directions Step In a bowl, mix fine sand and cornstarch together. Step Add dish soap and water, and combine thoroughly until well mixed. Step Add f