🔬Backyard Scientist attempts to create a foam water gun using the elephant's toothpaste experiment
🧪Challenges include finding a safe way to mix the chemicals and prevent reactions in the backpack
🔍Investigates Mark Rober's devil's toothpaste formula based on clues left in videos
💥Builds a reaction chamber and concentrates hydrogen peroxide to achieve faster reactions
🔫Designs a handheld foam gun after previous explosive failures