Finding an empty plastic film canister on the pantry floor, Ernest felt a strong desire to perform rocketry experiments right now:
1. Baking soda/vinegar foamed up too fast to launch the rocket.
2. Alka seltzer/water (the classic rocket formula): foamed up more
3. Alka seltzer/vinegar foamed up faster than the classic formula, and flew the rocket
higher. He plans to use this formula from now on.
Ernest has also experimented launching different items in his trebuchet. (Don't worry, we have a large back yard.) These are in order of greatest distance achieved.
2. water balloon
(Inside joke: This is the "trebuchet" font.)