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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 .
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 ...
Gen Z was born between 1997 and 2012 and is considered the first generation to have largely grown up using the internet, modern technology and social media.
Generation Archetype Generation birth year span Entered childhood in a Turning year span Late Medieval Saeculum (1435-1487) Arthurian Generation: Hero (civic) 1433–1460 (28) 3rd turning: unraveling: Retreat from France: 1435–1459 (24) [a] Humanist Generation: Artist (adaptive) 1461–1482 (22) 4th turning: crisis: War of the Roses: 1459 ...
Patrilineal and matrilineal most recent common ancestors (MRCAs) of living humans roughly between 200 and 100 kya [56] [57] with some estimates on the patrilineal MRCA somewhat higher, ranging up to 250 to 500 kya. [58] 160,000 years ago, Homo sapiens idaltu in the Awash River Valley (near present-day Herto village, Ethiopia) practiced ...