Linda,
by including the blubber activity you are connecting the children’s science understanding to a testable investigation.
Polar Bear Blubber – Science Fun
has the “Extra Experiments” which could easily arise as ‘take the next step’ and in each case the children could make predictions to their own starter question and extend their learning.
Try to use other types of insulators such as butter, cotton balls, or sand. Which one works as the best insulator?
Try using room temperature water or water that is 100 degrees Fahrenheit (Be careful with hot water when you are testing it). Does the glove work in these situations?