We were lucky to have 20 Durham University post graduate students visit school to work with the children in Year 3, Year 4 and Year 5. Throughout the morning children participated in 4 science investigations. Challenge 1 was to filter dirty water and see who could make it the cleanest. Challenge 2 was to use fruit to conduct electricity and build a circuit. Challenge 3 was to perform chemical reactions to power film canister rockets. Challenge 4 was to build a float using different materials to see which one could hold the most weight before sinking.