Easy Valentine’s Day experiment 💝 When you mix borax with hot water, the borax dissolves, creating a saturated solution. As the water cools, it can no longer hold as much borax, so the excess borax starts to come out of the solution and forms solid crystals. Pipe cleaners provide a rough surface for the borax crystals to attach to and grow, creating beautiful crystal formations over time ❤️ #science #stem #valentinesday #craft