Steve Spangler Science

Heartbleed Security Vulnerability Fixed   •   Get 2 Free Sick Science! Kits   •   Free Experiments by Email

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 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

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.

Reset your password -

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

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 Team

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

Exploding Pumpkin

The self-carving pumpkin trick.

Rating: 54321

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Just consider it a new way to carve a pumpkin at Halloween... the pumpkin is actually carved in the traditional way, but the pieces of the jack-o-lantern face get pushed back into place. A chemical reaction is triggered inside the pumpkin and the previously carved pieces are literally blown out of the pumpkin. If you didn't know that the pumpkin had been carved already, it would appear as if you magically carved the pumpkin with a single eruption. What about the science part of this? This method is a favorite among chemistry teachers, who use the demo to illustrate the energy released when you break a triple bond in a molecule of acetylene.

This information is provided for educational purposes only. Do not try this experiment. Make friends with your local chemistry teacher and let them amaze you with their pumpkin carving skills.

You will find a detailed discussion of the Exploding Pumpkin experiment on Steve Spangler's blog.


  • Steve Spangler on The Ellen Show November 2007
  • Exploding Pumpkins - Cool Science Experiment
  • Exploding Pumpkins - Cool Halloween Science
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The reaction that takes place inside the pumpkin uses calcium carbide to generate a very small amount of acetylene gas. When the gas is ignited, a tremendous amount of energy is released, which pushes the pieces of previously carved pumpkin out. Acetylene gas is very explosive. Mixtures with air containing between 3% and 82% acetylene are explosive on ignition.

This information is provided for educational purposes only. The popular Exploding Pumpkin experiment should only be performed by a trained professional.

Customer Reviews

Science Fun Review by Theresa

I'm a middle school teacher. We used these at our Halloween themed Parent Information night. It was a hit. We also used Steve's "exploding pumpkins" experiment - what a bang!

(Posted on October 15, 2009)

Super cool Review by Cal

I loved this experment i tryed it my self with my dad and it was super cool

(Posted on October 30, 2009)

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