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formal operations

Overview page. Subjects: Psychology.

In the theory of cognitive development of the Swiss psychologist Jean Piaget (1896–1980), the developmental stage beginning at about 12 years when children become proficient in manipulating...

See overview in Oxford Index

Morris, Nelson

Fred Carstensen.

in American National Biography Online

January 1999; p ublished online February 2000 .

Reference Entry. Subjects: Manufacturing; History of Manufacturing and Construction; Agriculture and Farming. 1296 words.

Morris, Nelson (21 January 1838–28 August 1907), cattle trader, breeder, and meatpacker, was born in Hechingen, Germany, a province of Hohensollern; his parents’ names are unknown. His...