Double Dip Chip – Cool Science Experiment


While some people think it’s no big deal, double dipping your potato chip is the same as putting your whole mouth into the bowl of dip. That’s the hypothesis… but is this true? Leave it to Steve Spangler and some clever fifth graders armed with Petri dishes, chips, dip and an aversion to double-dipping your chip to uncover the truth. The full write-up for this experiment is at

More About Steve Spangler Science…

Steve Spangler is a celebrity teacher, science toy designer, speaker, author and an Emmy award-winning television personality. Spangler is probably best known for his Mentos and Diet Coke geyser experiment that went viral in 2005 and prompted more than 1,000 related YouTube videos. Spangler is the founder of, a Denver-based company specializing in the creation of science toys, classroom science demonstrations, teacher resources and home for Spangler’s popular science experiment archive and video collection. Spangler is a frequent guest on the Ellen DeGeneres Show where he takes classroom science experiments to the extreme. Check out his pool filled with 2,500 boxes of cornstarch!

Cool Science Toys –
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Additional Information:

On the education side, Spangler started his career as a science teacher in the Cherry Creek School district for 12 years. Today, Steve travels extensively training teachers in ways to make learning more engaging and fun. His hands-on science boot camps and summer institutes for teachers inspire and teach teachers how to prepare a new generation for an ever-changing work force. Over the last 15 years, he has also made more than 500 television appearances as an authority on hands-on science and inquiry-based learning.

On the business side, Spangler is the founder and CEO of Steve Spangler Science, a Denver-based company specializing in the creation of educational toys and kits and hands-on science training services for teachers. The companys unique business strategies and viral creations have been featured in the Wall Street Journal, Inc. Magazine, Wired and TIME Magazine where online readers voted Steve Spangler #18 in the Top 100 Most Influential People of the Year for 2006 (what were they thinking?). You’ll find more than 140 Spangler created products available online at and distributed to toy stores and mass-market retailers worldwide.

Spangler joined NBC affiliate 9News in 2001 as the science education specialist. His weekly experiments and science segments are designed to teach viewers creative ways to make learning fun. His now famous Mentos Geyser experiment, turning 2-liter bottles of soda into erupting fountains, became an Internet sensation in September 2005 when thousands of people started posting their own Mentos explosions on

As founder of, Spangler and his design team have developed more than 140 educational toys and science-related products featured by mass-market retailers like Target, Wal-Mart, Toys R’ Us, Discovery Channel Stores and over 1,400 independent specialty toy stores. His educational science catalog and on-line business offers more than a thousand science toys and unique learning resources. Recently, Spangler has been featured in the Wall Street Journal, Inc. Magazine, WIRED, the History Channel, Food Network and TIME Magazine where on-line readers voted Steve Spangler #18 in the Top 100 Most Influential People of the Year for 2006.

His recent appearances on the Ellen DeGeneres Show have taught viewers how to blow up their food, shock their friends, create mountains of foam, play on a bed of nails, vanish in a cloud of smoke and how to turn 2,500 boxes of cornstarch and a garden hose into a swimming pool of fun.

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  1. @Stevespanglerscience the Mythbusters were right because they only tested their petry dishes for 1 day. its quite pointless to say that is is better to not double dip, it doesnt make that much difference: the salsa and chips themselves provide so many bacteria, that the double dipping contamination is so minuscule.
    Look at the full Mythbusters episode on this if you are not convinced.

  2. @ScarFace9797 you know I am biologist and I can tell you that there are billions of bacteria in every one of those Petri dish. If that bacteria get in your mouth you can get some really bad illnesses. That thing can really be dangerous.

  3. i did an experiment kinda like this where i went around my school and took a sterilized qtip and swabbed something. the agar looked like polka dots i swabbed the sink handles

  4. I am a molecular biologist and i can tell you that the whole experiment that is performed in the video is flawed. First of all you need to sanitize the media. Then you need to be doing this in a aseptic environment. You must have a blank and a positive. And to my eye that does not look like bacteria at all. It is more of a mold! Bacteria would be clumped together and less turbid. I would love to see this redone in the right conditions. And the common bacteria does not take 3 days to grow.

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