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No ... the real American has not yet arrived. He is only in the Crucible, I tell you—he will be the fusion of all races, perhaps the coming superman.
—Israel Zangwill (1864–1926)
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Adolescence has been recognised as a stage of human development since medieval times—long, long before the industrial revolution—and, as it is now, has long been seen as a phase which centers on the fusion of sexual and social maturity. Indeed, adolescence as a concept has as long a history as that of puberty, which is sometimes considered more concrete, and hence much easier to name and to recognize.
—Terri Apter (20th century)