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chutzpah & pingpong balls

Via a family member's blog, I discovered a physics story with this wonderful beginning:

It's the rare scientific mind that has the pure intellectual chutzpah to tackle a problem that has troubled boffinry since the discovery of cryogenics - namely, "What happens if you combine liquid nitrogen with 1,500 ping-pong balls?"

I wanna be in Roy Lowry's physics class! Talk about getting students' attention - one hopes for long enough that the underlying physics explanation for what they've observed can be generated.

My only complaint is that Someone Has Taken Down the Video at that link! But I know how to google & here we are anyway:

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Now that's something to try at home. I might use it as an illustration of Newton's laws in action - the question would be, why does the dustbin lift off the ground when the open end is at the top?

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