This story came across my Google alerts today from the crack team at ABC News… “Science of Mentos-Diet Coke Explosions Explained.” My fingers couldn’t click on the link fast enough. New research finally explains this amazing phenomenon? Here’s the opening sentence of the story…

The startling reaction between Diet Coke and Mentos sweets, made famous in thousands of YouTube videos, finally has a scientific explanation. A study in the US has identified the prime factors that drive the fizzy plumes from Coke bottles: the roughness of the sweet and how fast it plummets to the bottle’s base.

What… this is the big discovery? The Mentos chewy mints have a rough surface and they’re heavy? Well, they’re absolutely correct and they confirmed the original Mentos Eruption explanation published back in 2005. Tonya Coffey, a physicist at Appalachian State University in Boone, North Carolina said, “This was a good project for my students to study because there was still some mystery to it.” Hats off to Coffey and her students for publishing her findings and bringing peer review to the Mentos Geyser experiment.

However, it was nice to have someone else confirm our findings that either fruit or mint Mentos work equally well. “The results showed that Diet Coke created the most spectacular explosions with either fruit or mint Mentos, the fountains travelling a horizontal distance of up to 7 metres.”

It was probably most fun to read the comments on the ABC News blog. What questions or “mysteries” about the Mentos reaction would you like to ask?

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Tune into Food Network’s Unwrapped to get a peek inside the Spangler Science labs as Steve shares the science behind the Mentos Geyser all of that exploding soda. Back in December, I mentioned that a crew from Unwrapped on the Food Network wanted to get the real scoop on the popular Mentos and soda reaction. The crew spent an entire day grabbing the reaction from every angle and trying to understand how all of those tiny bubbles produce such a huge fountain of soda. The episode is scheduled to air on September 24, 2007. Consult your local listing for time and channel.

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Thousands of science teachers found their way to St. Louis for the 2007 National Science Teachers Association convention, and we wanted to make sure they had something to take back to their students. So, we loaded our trucks with experiments and products from the website along with 5,000 rolls of MENTOS stuffed into plastic test tubes and headed for the Gateway City. We were fortunate to have 14 teacher ambassadors from the Hands-on Science Institute join us in the booth to each share their favorite science activities. Aside from 500 bottles of Diet Coke and a mountain of MENTOS, all eyes were on the 18 foot tall soda eruption chamber. We were demonstrating the new Geyser Tube by triggering a MENTOS geyser as fast as we could set-up a launch (about every 2-3 minutes for 3 full days). At the end of the convention, the soda was gone, the rolls of MENTOS were in the hands of 5,000 teachers, the truck was cleaned out… and we all had a blast. It’s back to the classroom for the 14 ambassadors to start working on cool stuff for next year’s NSTA in Boston.

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We’re excited about the official launch of our new Spangler Geyser Tube. Think of it as the perfect Mentos loading device to trigger a 30 foot geyser of soda. Just load the Mentos candies into the tube, lock the nozzle in place and pull the pin. Okay, it’s bes

t to pull the pin and then run away. The Mentos drop into the bottle triggering the reaction and the powerful soda geyser comes shooting out the top with enough pressure to reach an incredible height of 30 feet. Onlookers scream, “Do it again!”… and you do.

The Geyser Tube retails for $4.95 and is currently only available at www.SteveSpanglerScience.com However, as a result of our licensing agreement with the maker of Mentos (Perfetti Van Melle), the Spangler Geyser Tube will be released into mass market distribution (all of the major toy stores, print catalogs and online stores) in June 2007.

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Our new Geyser Tube toy made it’s first public appearance at the Toy Fair in New York this morning. If you’ve ever tried to do the Mentos Geyser experiment, you know that it’s tough to a handful of Mentos candies into the bottle of soda before it starts to erupt. The Geyser Tube is a trigger device that holds a stack of Mentos candies directly above the opening of the bottle. Just pull the pin and the Mentos instantly drop into the soda and the soda geyser shoots up through the nozzle at the top of the tube.

Over the past year, we’ve come up with many ways The Geyser Tube attaches to the top of any 2-liter bottle and holdsof sodatrigger device that suspends a stack of Mentos candy above the open bottle of soda. When you pull the pin, the Mentos drop and the erupting soda is funneled updevice that holds

Steve Spangler, a science editor for a Colorado TV station and a toy maker on the side, this week demonstrated his “Geyser Tube” at the Toy Fair in New York. His toy is a plastic tube that can hold nine Mentos candies. A pin holds the candy in place while the tube is screwed to the top of the soda bottle. The opposite end is a narrow opening that acts like a nozzle.

A string is attached to the pin and when pulled, the Mentos plop to the bottom of the bottle, triggering the reaction. The Geyser Tube retails for $4.95 and can be purchased online at Stevespanglerscience.com.

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It has the potential of being the most popular science fair project of all time. The Mentos Geyser is definitely fun to watch, but some teachers are missing the opportunity to use the activity to teach science. Over the last few weeks, I’ve received emails from students explaining that their teachers are forbidding them from doing the Mentos Geyser as a science project. Why? The common response is… “there’s no science to blowing up pop.”

What? How did these teachers miss the rich science content that oozes from the bottle with every eruption? Combine the strong science with the student’s motivation to want to use the scientific method and you’ve got an amazing activity.

Brian Rice, a math teacher at Gwinn Middle School in Michigan, recently used the Mentos Geyser as a great teaching opportunity. As one of the experiments, the middle schoolers measured how high pop would spray when a Mentos candy is dropped into the pop bottle. In one day, eighth-grade classes and some seventh-grade classes conducted the Mentos and pop experiment with the objective to see whether different types of pops have greater eruptions. They ended up testing a total of 44 different varieties, ranging from Diet Coke to root beer.

This is a great example of science in action. Here’s to Brian Rice - a great teacher who gets it! Instead of forbidding the activity, Mr. Rice uses the Internet sensation to grab his students’ attention and put the scientific method to the test.

Your can read the article that appeared in the Mining Journal on January 8, 2007.

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Just the thought is scary… but I’m talking about the popular show Unwrapped on the Food Network. Producers from the show called to see if they could get a better look at the science behind the Mentos Geyser Experiment and to see if they could get a sneak peek at our new line of Geyser Tube toys. Not only did they get an up close view of the spewing soda geyser, the crew learned how to cook with 20 liters of liquid nitrogen.

I forgot to mention to the photographer, Andy McDonald, that he and his expensive HD camera would disappear in a giant cloud of smoke when I poured out the liquid nitrogen. The good news is that no one died when we wrapped up the day with a round of exploding, self-carving pumpkins.

We’ll let you know when the Food Network announces the air date.

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The Mentos Geyser made history once again as the star attraction at the NAEYC 2006 Conference in Atlanta, Georgia. Over the rumble of the crowd in the exhibit hall, you could hear someone from the Spangler Science booth yell, “GEYSER!” followed by a few screams and cheers of excitement. The “geyser” was actually the eruption of a two-liter bottle of Diet Coke powered by Mentos. As soon as people approached the booth and saw the mountain of soda and the display of Mentos, they knew what could happen… but most people didn’t believe that we would actually launch the geysers from behind the booth. Surprise!

Instead of just launching the Diet Coke just for fun sake, we used each opportunity to deliver a quick science lesson and followed it up by putting one of our Geyser Tube Experiments in each of the teacher’s hands. Out of the 11,000 people reported to be in attendance at the event, we personally handed out 7,000 Geyser Tube Experiments (which included a roll of Mentos). We even had a few guest “geyserists” take center stage in the booth and try their hand at a launch.

This is not the first time these educators had seen or performed our Mentos Geyser which was featured on stage three years ago in Anaheim, California at the 2003 NAEYC Conference. One teacher commented, “We’ve been doing this experiment for the past three years, and it took the rest of the world this long to catch up!”

Read the rest of this entry »

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In addition to being the Business Columnist for the Denver Post, Al Lewis is now a fan of the Mentos and soda mixture. Al called last week with questions about our recent license agreement with with Italian confectioner Perfetti Van Melle, the maker of Mentos. His column entitled Mentos-Soda Mix a Mint for Scientist looks at the business side of the popular Mentos Geyser. He asked lots of questions about things other than my work on the Mentos experiment. He wanted to know about my background, my teaching and my parents.

“Let me get this straight,” I said to Spangler. “Your father was a scientist and a magician. David Copperfield hung out at your house. You are now 39 years old. And getting a pop bottle to squirt 20 feet in the air is the best trick you know?”

“This isn’t the best trick,” he said. “It’s the trick that got the most notoriety.”

Al also wanted to learn how this science experiment turned into a viral marketing sensation with the Mentos video that aired on 9NEWS in September of 2005.

Al asked me if teachers are really doing this experiment and how they’re turning it into a learning experience. Share your Mentos Geyser experiment with Al Lewis on his blog.

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