Hopsa
A catapult is a lever: pressing the top stick down bends it and stores energy, and letting go turns that energy into a flying pompom. Changing one thing at a time and watching what happens is the heart of the scientific method, and kids happily repeat it 50 times.
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
