The tie-dyed shirts really make the Mentos thing work work….
What was the heavy gas he was using? Argon?
In other times I’ve seen the heavy gas demo, sulfur hexafluoride was used. Stable but very pricey.
Details on the rapidly expanding foam, anyone?
The foam is called ‘elephants toothpaste’. There are lots of videos and info online.
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A novel by Greg Laden ...
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