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Copper Age
(Encyclopedia)Copper Age: see Bronze Age.iron lung
(Encyclopedia)iron lung, device used to maintain artificial respiration over an extended period of time. Before the successful vaccination program against poliomyelitis, it was used mostly in treatment of that dise...sherardized iron
(Encyclopedia)sherardized iron: see galvanizing. ...iron pyrites
(Encyclopedia)iron pyrites: see pyrite.Iron, Ralph
(Encyclopedia)Iron, Ralph: see Schreiner, Olive. ...Iron Cross
(Encyclopedia)Iron Cross: see decorations, civil and military. ...mental age
(Encyclopedia)mental age: see intelligence.old age
(Encyclopedia)old age: see geriatrics.Ice Age
(Encyclopedia)Ice Age: see Pleistocene epoch.Golden Age
(Encyclopedia)Golden Age, in classical mythology: see mythology. ...Browse by Subject
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