Why is glass in old buildings thicker at the bottom and thinner at the top? Is it that glass is a viscous liquid? - Quora
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Why is glass in old buildings thicker at the bottom and thinner at the top? Is it that glass is a viscous liquid? - Quora
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Fact or Fiction?: Glass Is a (Supercooled) Liquid - Scientific American
Does Glass "flow"?
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Can cold glass flow? | Britannica
Does Glass "flow"?
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Does glass flow? - Quora
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Revisited Myth #18: Panes of window glass in old buildings are visibly thicker at the bottom, proving that glass is a viscous liquid that has “flowed” over time. | History Myths Debunked
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View through a very old window with ancient glass Stock Photo - Alamy