The Ketchup Experiment! Kid friendly site with lots of neat experiments! It has one that makes a rocket out of a film canister, which would be good for an grade space unit, but it has to many kid friendly expiriments. Great site for any science teacher.
Cleaning the glass oven door: Combine about cup of baking soda and enough water to make a slightly runny paste. Spread the mixture all over the glass and the door if needed. Wait for minutes, before wiping the paste from the oven door.