Do make sure the area is well-ventillated. This demonstration once set off my carbon monoxide alarm.

Not sure what you're using as a source, but we've just started using these single color flashlights. a.co/d/hmkqHrH

A little harder to make, but slightly more advanced fidget spinner lazy Susan. docs.google.com/document/d/1...

Reminds me a bit at the beginning of Iain M. Banks's Transitions.

I love this experiment and have done it with students many times. Something unusual happens if you put a microphone inside the bell jar while at vacuum. For example, if you can get your phone to auto answer while under vacuum, it isn't as quiet as might expect.

#ITeachPhysics #ITeachBiology #ITeachChemistry #ITeachEnvironmentalScience #APES

#ITeachPhysics #ITeachAstronomy

We also have a design for a classroom version. Works great with just D batteries. www.exploratorium.edu/snacks/circl...

Making your own version isn't too hard, and it's adjustable. www.exploratorium.edu/snacks/mind-...

🎢 Darek Dewey has some of the most surprising and creative demos and I hope to see him here soon! "No matter what angle you drop the rod at it always ends up straight at the bottom of brachistochrone curves."

🎢 Brilliant demonstration from @cossettej.bsky.social of the relationship between normal force and friction force on a car.

The article on hydrogen powered cars was kind of fast and loose with the facts. Describing gasoline and hydrogen as equally dangerous is not true. Gasoline explodes with mixtures between 1.2% and 7.1%, while hydrogen ignites in ranges of 4% to 74%.

Alas, I live in California, but I'll be in London on holiday next week! I'm retired from the classroom, but I still design science activities for teachers, and facilitate workshops for teachers. And like you, I do science shows and have even worked with magicians.

Love your work!