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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 .
Millennials struggle with dental and oral health. More than 30% of young adults have untreated tooth decay (the highest of any age group), 35% have trouble biting and chewing, and some 38% of this age group find life in general "less satisfying" due to teeth and mouth problems. [205]
A millennium (pl. millennia or millenniums) is a period of one thousand years or one hundred decades or ten centuries, [1] [2] sometimes called a kiloannum ...
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List of decades, centuries, and millennia; 0–9. 1st millennium; 2nd millennium; 3rd millennium This page was last edited on 22 January 2021, at 04:39 (UTC). Text is ...
Authors William Strauss and Neil Howe, who created the Strauss–Howe generational theory, coined the term 'millennial' in 1987. [15] [16] because the oldest members of this demographic cohort came of age at around the turn of the third millennium A.D. [17] They wrote about the cohort in their books Generations: The History of America's Future, 1584 to 2069 (1991) [18] and Millennials Rising ...
Chalcolithic (or "Eneolithic", "Copper Age") Ancient history (The Bronze and Iron Ages are not part of prehistory for all regions and civilizations who had adopted or developed a writing system.) Bronze Age; Iron Age; Late Middle Ages. Renaissance; Early modern history; Modern history. Industrial Age (1760–1970) Machine Age (1880–1945) Age ...
Age: 2 148 and 2/3 of a year: A superstitious unit of time used in astrology, each of them representing a star sign. terasecond: 10 12 s: About 31,709 years. megaannum: 10 6 yr: Also called "megayear". 1000 millennia (plural of millennium), or 1 million years (in geology, abbreviated as Ma). petasecond: 10 15 s: About 31 709 791 years. galactic ...