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The article says the glass does actually have a viscosity, so maybe she was not quite that wrong - just about the magnitude.

I think glass has a viscosity, but other solids do not, but will creep.

I hope my understanding is correct - if not, can anyone help explain?

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I believe you are correct. I had to shorten the title, and removed “observable” because the word “medieval” already refers to the science class meme that the viscous flow is at human history timescale (as opposed to ~1 nm/10^7 years).

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