Last November, we had Innovation Day at school. Each departed had to do something and involve the students. Since I don't really get a chance to do any 'fun' experiments in science class, I decided to do Elephant toothpaste with the students.
These are the ingredients used. Just google 'Elephant Toothpaste' to get the explanation of the chemical reaction that occurs. You can even do it at home with your kids, they will love it!