Here's what you need to make your Unpoppable Balloon!
Blow up the balloon
Poke the skewer into the balloon
Make the second hole
Amaze your friends!
You’ve just inserted a skewer through a balloon!
Amaze your friends again!
Pull the skewer through and out. The holes will close and hardly any air will escape.
Destroy the evidence
Did you know?
Rubber is made of long, springy chains of molecules. Pushing the skewer into a thick pile of these molecules is like pushing your finger into a bowl of cooked spaghetti. Your finger pushes the spaghetti aside and slips between the strands. Even though they move aside, the strands stay in contact with your skin. In a balloon, the skewer pushes the rubber’s long molecules aside. They flex a little and squeeze against the skewer, making a tight seal. Engineers do seemingly amazing things by understanding their materials.
Try this next!
Add some showmanship by failing at the trick first. Blow up a balloon. Tell your friends you can pass a skewer through it without popping the balloon. Poke the skewer into the thin side of the balloon. POP! Look confused. Your friends will be laughing. In a determined voice, say, “Let me try that again!” This time, do the trick as described. Your friends will be amazed!