Hopsa
Baking soda and vinegar make carbon dioxide gas, which takes up far more space than the powder and liquid did, so the sealed bag swells until the seam gives way. Waiting at a safe distance with goggles on is also great practice in self-control.
The steps are in the app
Step-by-step instructions, tips and an easier and a harder version are waiting in the Hopsa app – along with 300 more ideas matched to your kids’ ages.
Coming soon to the App Store and Google Play
