Quick Fact: King of Bohemia Charles IV, who commissioned the construction of…

King of Bohemia Charles IV, who commissioned the construction of Prague’s Charles Bridge in the 14th century, was rumored to have ordered that egg yolks be added to enrich the mortar and strength the bridge’s structure. Scientific evidence indeed found the presence of egg proteins in the mortar.. Ref: www.prague.net/charles-bridge-museum

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