Even germanium oxide glass, which flows more easily than other types, would take 10 to the 32 power years to sag, (that's a 10 with 32 zeros) Zanotto calculates. Medieval stained glass contains impurities that could lower the viscosity and speed the flow, but even a significant reduction wouldn't alter the conclusion, he remarks, since the age of the universe is only 10 to the 10th power.
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