I was sorry to miss this event but Lynn sent me pictures.This was a lesson in viscosity. They started with water and added oil. They placed three separate dry ingredients into the water/oil, one at a time: sugar, salt and baking soda. They counted the number of bubbles that rose up, observed their size and frequency and made comparisons. They compared each addition and then added more oil, made observations and made further comparisons. It was like making a personal lava lamp. The water was quite viscous at the end.
Thank-you Harry and Jen Yan who came to class to guide this exploration.