Goldilocks and the 3 Bears

We have started a unit on folktales and fairytales, beginning with the story of Goldilocks and the 3 Bears.  This week we read Jan Brett’s version, and then retold the story in writing, saying what happened at the beginning, middle, and end of the story.  Later we read a slightly changed version called “Dusty Locks and the Three Bears”, which is set in a wild west town.  In this telling, Dusty Locks is a little girl who never bathes, hence her name.  She visits the bears’ house, eats their porridge, breaks the chair, and falls asleep in the bed, just like the traditional version.  The surprise comes at the end, when Dusty’s mother makes her take a bath, and the bears pass her on the street without recognizing her.  We discussed with partners what was the same and what was different between Dusty Locks and Goldilocks.  On Friday we read “Somebody and the Three Blairs.”  This story really twists the folktale: the Blairs, a nice human family, go out for a walk.  While they are gone Somebody (Baby Bear) decides to break into their house, and he causes all sorts of mischief.  The funniest moment comes at the end, when Baby Blair discovers Somebody sleeping in his bed and says “Issa big teddy bear!”  The kids loved it!

To extend our learning and reading, I turned the dress up centre into the Three Bears’ house.  With three bowls, three spoons, three pillows, and masks from the drama room, students have been having lots of fun acting out the story.  I love hearing the cries of “This porridge is too hot!” and “Someone’s been sitting in my chair!”

Oobleck!

Last Thursday we had two guests in class: Mr. and Mrs. Collins.  My mom and dad came to share a story and do some science.  The kids were very excited!

Mr. Collins read “Bartholomew and the Oobleck” by Dr. Seuss.  It’s a story about a king who is tired of sun, fog, rain and snow, so he orders his magicians to create a new kind of weather.  They create Oobleck, which falls from the sky as sticky green blobs.  The king is fascinated at first, until everything and everyone in his kingdom is covered in the stuff.  Bartholomew helps the king to see his mistake, and when the king says “I’m sorry” the Oobleck melts away.

After listening to the story, Mrs. Collins explained how to make Oobleck.  We mixed 1 cup of cornstarch with 1/2 cup of coloured water.  The students worked in pairs to stir their Oobleck, taking turns holding the container and stirring.  The result was goopy and sticky, but we couldn’t decide if it was a solid or a liquid.  You can roll it into a ball, but if you stop rolling it oozes through your fingers.

After lots of exploring, and a little mess, we came back together to talk about what we discovered.  We learned that Oobleck is a non-Newtonian fluid; it isn’t really a solid or a liquid.  When you apply pressure to it by rolling or squeezing, it feels like a solid.  When there is no pressure it acts like a liquid, dripping through fingers and taking the shape of its container.  Then we watched a video of dancing Oobleck.  The sound waves from a speaker make the Oobleck dance.

I loved having my parents visit, and they like coming since they are both retired teachers.  Plus the kids got to be messy and do science.  It was a really fun afternoon!

Click here to find out more about Oobleck and non-Newtonian fluids

Mad Science Workshop

On Friday we had Mary come from Mad Science with her cooler full of dry ice.  We had already learned about solids, liquids, and gases, and had talked about how when solids changed to liquids we call it melting, and when a liquid changes to a gas it evaporates.  Mary taught us a new word: sublimate.  That describes what happens when matter changes straight from a solid to a gas.  We had lots of fun watching her experiments, including blowing up a balloon with carbon dioxide, and hearing a warm spoon screech when it was held against the block of dry ice.  The highlight was the dry ice shower!  Each person got to catch a bubble filled with carbon dioxide, so much fun!

Here's mary with the block of dry ice. It's -79º C
Dry ice sublimating to carbon dioxide in warm water
Looks like a witch's cauldron! Dry ice is how they used to make fog for movies.