■ Material cost: $1
■ Working time: 10 minutes (excluding water absorption time)

【Materials】
· Water beads
· balloon
· water
· Empty plastic bottle

【How to make】
1. Let water beads absorb moisture.
2. Place in an empty plastic bottle
3. Inflate balloon and put the mouth over the plastic bottle.
4. Transfer the water beads to the balloon and push out the air as much as possible.
5. Complete by tying the balloon