Coke Gyser

Poppi read online about how putting Mentos (one type only) into a soda would cause the soda to explode.  He thought this would be a fun experiment to do with the boys.  THEN, after watching a few videos of failures online, he thought "hmmm, this might be a bit dangerous" and decided NOT to do it.  However, the idea seemed too fun, so he thought of a way to do it safely.

He jerry-rigged a safety device that would allow him to drop the mentos into the tube, with the safety panel in place, remove safety panel and run back to safety as mentos dropped into unsuspecting soda below.  A LOT of time and effort went into this little experiment.

Here's where it didn't work.

The safety device was TOO safe, and did not allow the mentos to fall into the soda.

Here is where it DID work

pretty cool!