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On Monday we learned about a vulnerability in the encryption technology that effects most of the internet, called Heartbleed. Our team grabbed their lab coats and leaped into action to patch the vulnerability on our site.

We are happy to announce SteveSpanglerScience.com is no longer vulnerable.

While we believe we have kept out all the bad guys, we want to make sure our customer's information is safe. We are requiring that all of our customers change their password for their accounts on SteveSpanglerScience.com.

To do so, click the link below and enter in the email address associated with your account. Once you receive an email to that account, follow the simple instructions to reset your password.

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If you have any questions on password resetting, please call our Customer Service team and they will be happy to help you. 1-800-223-9080

If you have any questions about the vulnerability please email security@SteveSpangler.com

As this did effect most of the internet, we also recommend that you change your passwords on all of the websites you visit.

Thank you for being an amazing customer!

-- The SteveSpanglerScience.com Team

Questions? Give us a Call: 1-800-223-9080

Marshmallow Masher

Squish marshmallows into the size of an after dinner mint.


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Item #: WMMM-700

Usually ships the next day.

Availability: In stock

Marshmallow Masher

Experiment with the powerful properties of air as you squish marshmallows with air pressure all day long. Your students will be amazed that a huge marshmallow can end up looking like an after dinner mint! Campouts with toasted globs of spun sugar will never be the same. Recommended for children ages 6 and up.

What's Included?
  • 473 mL (16 oz.) bottle
  • Pressurizing pump (Fizz-KeeperĀ®)
  • Large plastic test tube
  • Activity guide
How Does It Work?

Put some marshmallows in your bottle and attach the pressurizing pump. Then pump air into the bottle. As the pressure inside the bottle increases, there will be more pressure outside the marshmallows than inside. The marshmallows begin to shrink and look wrinkled because the air molecules inside them are pushed closer together by the difference in pressure. When you take the top off the bottle, they return to full size! Use the large plastic test tube to experiment with pumping smaller quantities of marshmallows.

What Does It Teach?

Learn about the properties of air and discover some facts about air pressure. Experiment with changing the balance of pressure to achieve a certain result. The best thing about this experiment is that when you're finished, you can eat it!

Customer Reviews

Another "Keeper" Review by Kathy Wilmovsky

This is a great way to demonstrate air pressure. The class was entranced as the marshmallows shrank as pressure was added and expanded back to normal once the pressure was released. The only issue I had at all was letting my students use the masher. I have several who I would be afraid would pump, and pump and pump until the bottle exploded. Therefore, I ended up just doing this as a teacher demonstration for the class.
(Posted on 5/5/13)

cool Review by jeff Sowers

I love your stuff it is so cool to use in kids church.
Thanks Pastor Jeff (Posted on 3/25/13)

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Warning - Choking Hazard