Today, in our after-school club led by a scientist, the young children investigated the energy content of food by burning a stale crisp and using the released energy to heat water. We discovered that one crisp equals 6 calories. This was super exciting to watch. 
The young scientists also measured their energy expenditure by jogging on the spot. For our final experiment, the children filled a bottle halfway with water and then poured in about 100ml of oil. They then observed the oil float on the water. They were fascinated by this observation. We also estimated the length of a child's intestine during the session, adding to our exploration of the human body. They're eagerly looking forward to next week's experiment with slime.