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While writing Generations, Strauss and Howe described a theorized pattern in the historical generations they examined, which they say revolved around generational events which they call turnings. In Generations, and in greater detail in The Fourth Turning, they describe a four-stage cycle of social or mood eras which they call "turnings". The ...
A generation is all of the people born and living at about the same time, regarded collectively. [1] It also is "the average period, generally considered to be about 20–30 years, during which children are born and grow up, become adults, and begin to have children." [2] In kinship, generation is a structural term, designating the parent ...
Theory of generations (or sociology of generations) is a theory posed by Karl Mannheim in his 1928 essay, "Das Problem der Generationen," and translated into English in 1952 as "The Problem of Generations." [1] This essay has been described as "the most systematic and fully developed" and even "the seminal theoretical treatment of generations ...
Turning ages 28 to 43 this year, per Pew Research Center (the definitive source on generations that has nevertheless retired the concept of generational framing), millennials are a generation ...
The term second generation warfare was created by the U.S. military in 1989. Third-generation warfare focuses on using late modern technology-derived tactics of leveraging speed, stealth, and surprise to bypass the enemy's lines and collapse their forces from the rear. Essentially, this was the end of linear warfare on a tactical level, with ...
Millennials, also known as Generation Y or Gen Y, are the demographic cohort following Generation X and preceding Generation Z. Researchers and popular media use the early 1980s as starting birth years and the mid-1990s to early 2000s as ending birth years, with the generation typically being defined as people born from 1981 to 1996. [1][2 ...
t. e. Fourth-generation warfare (4GW) is conflict characterized by a blurring of the distinction between war and politics, and of the distinction between combatants and civilians. It is placed as succeeding the third generation in the five-generation model of military theory. The term was first used in 1980 by a team of United States analysts ...
In biology, evolution is the process of change in all forms of life over generations, and evolutionary biology is the study of how evolution occurs. Biological populations evolve through genetic changes that correspond to changes in the organisms ' observable traits. Genetic changes include mutations, which are caused by damage or replication ...