This STEM activity is an easy one to make children wonder, ask questions and want to learn more. Materials like these plastic zip bags can stretch a bit. When poking the pointed end of a toothpick into the bag, the surface of the bag will stretch and try to retract to its original shape. This makes the toothpick tight and the water does not flow out!
What you’ll need
- Chanafavors Free Printables
- Permanent Marker
- Zip Bags
How to Set Up
- Print the Chanafavors free printable file for the template. Draw a puffer fish on a zip bag or trace it from the template with a permanent marker.
- Pour the water into the zip bag.
*When pufferfish are threatened, they fill their bellies with water and inflate about several times their size. Some puffers also have spines on their skin to repel predators.