So we had ordered some stuff and lots of boxes, packing paper and packing peanuts to add to our collection of activity builders. This will only work with the biodegradable peanuts. First, we used them in our sensory tub with toothpicks to build sculptures with. Then I gave the kids spray bottles and let them soak the peanuts with water. They immediately began to break down and become sticky. We added a little colored water to the mix and squished it around. So much fun and a good lesson on biodegradability. We had some other packing peanuts that were not biodegadable so it was an excellent science experience to compare the two.