I ran across this experiment courtesy of Steve Spangler this morning. Since we were headed to the grocery store, it was easy to grab the ingredients (all 2 of them!). The boys were tremendously curious about what we were going to do - it’s not often that I buy a 2-liter bottle of soda. They were suitably impressed!

Adding mentos to a bottle of diet coke creates an amazing geyser. The most difficult part is getting the candy into the soda all at once. We used a paper funnel, but both times we did it, only part of the candy made it into the bottle before the kids ran. We are curious about just how high the coke would go if all of the candy made it into the jar. We discussed trying this with smaller bottles, or even creating a film canister rocket. Hmm…