A few months ago, one of my frequent program-goers made a request: Would I please be able to offer a program that includes slugs, one of his favorite animals? I was inclined to agree to the challenge, even before said child had his mother email me a photo of him with his three pet slugs. How’s a librarian to say “no” to that?
I gave some thought to how I could meet the “slug” challenge while also closing out a season of many science-themed programs. I decided to return to a favorite concept with school-agers—slime—and explore it from two different perspectives: animal biology and physics. Thus “The Science of Slimy Things” was born.
The program was divided roughly into two parts, the first considerably less messy than the second. We opened with an exploration of slugs—pictures, how they move, their scientific names, how they differ from snails, and the purpose of their slime. Happily, the non-fiction stacks had plenty of resources to support this exploration.
Then we got hands-on with slug slime. No, not real slug slime, as I don’t have regular access to the potionmaster’s storecupboard. Instead, I had prepared some gelatinous, fibrous slime (recipe below) the morning of the program and brought it with me to the library. It sat in the staff fridge with a note saying “NOT Jello—Do NOT eat!” until program time. Once we had talked about slugs, I doled out scoops of the orange goo on paper plates for each of the attendees. I provided them with popsicle sticks and index cards to use to explore and manipulate the slime, but many of them opted just to use their hands. I’m sure none of us are surprised.
When everyone felt that, having tested its viscous properties, they had had a good play with the slug slime, we scooped it all back up into the plastic container. After a brief stop in the restroom to wash hands, we all trooped outside to the library’s patio for the really messy activity of the program.
Our second exploration of slime was oobleck, that substance owing its name to Dr. Seuss. I had some sample oobleck to accompany the intro to this type of slime. We discussed how oobleck is a non-Newtonian fluid—that is, it has properties of both a solid and a liquid depending upon the force being exerted upon it. To demonstrate, I set a toy farm animal on top of a pool of water (it sank) and then on top of the pool of oobleck (it sank, albeit more slowly). With a minimal amount of pressure acting against the oobleck, it acts like a liquid. To demonstrate how it acts like a solid, I used a mallet as my tool. First, I slammed the mallet into the pool of water; it splashed magnificently. When I raised the mallet to slam it onto the pool of oobleck, many of the kids leaned backward in expectation of a colossal oobleck splatter. Instead, there was none; the sudden strong force of mallet against oobleck caused the oobleck to act like a solid. Cue the pronouncements of “How cool!”
After making sure the kids had retained the term “non-Newtonian fluid,” I split everyone into groups to make their own oobleck. It was a messy, experimental process, as kids had to fiddle with the balance of ingredients in their slime (recipe below). Once they all had slime, the patio was a mess of kids scooping up oobleck, rolling it into a ball in their hands, and then letting it drip through their fingers. (I am happy to report that it rained a LOT the day after the oobleck project, which had left the outdoor patio quite covered in dried slime.)
When kids had had enough of the messy oobleck, I handed out empty prescription containers so that kids could take a bit of slime home with them. Kids bottled it up, then went their merry way to wash hands.
My program-goer who requested the slug aspect of the program said he was very happy with how the program had turned out—he liked getting to play with slug slime, and the oobleck was a great surprise as well. Talk about enjoying the finer things in life.
The Recipe for Slug Slime:
- 7 cups water
- 10 tsp Metamucil powder
Pour the water into a stovetop-safe saucepan, then stir in the Metamucil until dissolved. When the mixture is dissolved, turn on the burner to medium-high heat. Heat the mixture for 5-7 minutes, stirring frequently, until it reaches your desired consistency. The mixture will be gelatinous and gloopy. Let cool before handling.
The Recipe for Oobleck:
- 1 to 2 cups cornstarch
- 1 cup water
Pour 1 cup of the cornstarch into a mixing bowl. Slowly add in the water, gently stirring with a spoon or with hands. Keep adding water until the oobleck starts to thicken; you’ll know it’s ready when you tap on it and it hardens. If the oobleck is too runny, add more cornstarch; if too thick, add more water.