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The Strauss–Howe generational theory, devised by William Strauss and Neil Howe, describes a theorized recurring generation cycle in American and Western history.According to the theory, historical events are associated with recurring generational personas (archetypes).
The earliest evidence for life on Earth includes: 3.8 billion-year-old biogenic hematite in a banded iron formation of the Nuvvuagittuq Greenstone Belt in Canada; [30] graphite in 3.7 billion-year-old metasedimentary rocks in western Greenland; [31] and microbial mat fossils in 3.48 billion-year-old sandstone in Western Australia. [32] [33 ...
In population biology and demography, generation time is the average time between two consecutive generations in the lineages of a population.In human populations, generation time typically has ranged from 20 to 30 years, with wide variation based on gender and society.
With the start of a new year on Jan. 1, 2025, comes the emergence of a new generation. 2025 marks the end of Generation Alpha and the start of Generation Beta, a cohort that will include all ...
The start and end of a new generation is sometimes vague, but these generation group names are often used for individuals born between the following years: Greatest Generation: 1901-1927. Silent ...
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–child relationship. In biology, generation also means biogenesis, reproduction, and procreation.
See calendar and list of calendars for other groupings of years. See history , history by period , and periodization for different organizations of historical events. For earlier time periods, see Timeline of the Big Bang , Geologic time scale , Timeline of evolution , and Logarithmic timeline .
Generation Z: Annual income of $128,000, net worth of $487,711 Millennials: Annual income of $525,000, net worth of $1,699,571 Generation X: Annual income of $130,000, net worth of $1,213,759