Keeping cool...

As an introduction to exploring insulation we did an exciting experiment today. In the morning the students had to create a container that would keep some ice from melting for at least 4 hours. After lunch the students then opened their containers up and saw the results which went into the inquiry books. We had a big discussion about why some containers worked and others didn't work as well.

How would you create an insulating box to keep ice from melting?