Today in Class 2 we have taken part in an Investigation to find out what material would be best to keep an 'Ice Troll' frozen. We tested 5 different materials to find the best insulator. The materials we tested were newspaper, bubble wrap, silver foil, a plastic carrier bag and cotton wool. We made sure our test was fair by keeping the conditions and time the same. We found out that cotton wool was the best insulator because it was lots of air between its fibres and the trapped air stops heat transfer.