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25,000,000 – 50,000,000 (estimated) The Black Death was a bubonic plague pandemic occurring in Europe from 1346 to 1353. It was one of the most fatal pandemics in human history; as many as 50 million people [ 2] perished, perhaps 50% of Europe's 14th century population. [ 3] The disease is caused by the bacterium Yersinia pestis and spread by ...
This 3.8-year gap, however, is the lowest it has been since 1975 at the latest, the greatest difference being 7.1 years in 1993. [71] In contrast, Asian American women live the longest of all ethnic and gender groups in the United States, with a life expectancy of 85.8 years. [ 72 ]
In mathematics, a percentage (from Latin per centum 'by a hundred') is a number or ratio expressed as a fraction of 100. It is often denoted using the percent sign (%), [ 1] although the abbreviations pct., pct, and sometimes pc are also used. [ 2] A percentage is a dimensionless number (pure number), primarily used for expressing proportions ...
Old age cannot be universally defined because it is context-sensitive. The United Nations, for example, considers old age to be 60 years or older. [10] In contrast, a 2001 joint report by the U.S. National Institute on Aging and the World Health Organization [WHO] Regional Office for Africa set the beginning of old age in Sub-Saharan Africa at ...
The highest score obtainable by direct look-up from the standard scoring tables (based on norms from the 1930s) was IQ 171 at various chronological ages from three years six months (with a test raw score "mental age" of six years and two months) up to age six years and three months (with a test raw score "mental age" of ten years and three ...
The longest-lived of these isotopes, and the most relevantly studied, are 90 Sr with a half-life of 28.9 years, 85 Sr with a half-life of 64.853 days, and 89 Sr (89 Sr) with a half-life of 50.57 days. All other strontium isotopes have half-lives shorter than 50 days, most under 100 minutes.
The U.S. population almost quadrupled during the 20th century – at a growth rate of about 1.3% a year – from about 76 million in 1900 to 281 million in 2000. [17] It is estimated to have reached the 200 million mark in 1967, and the 300 million mark on October 17, 2006.
The percentage of non-Muslims in Turkey fell from 19.1% in 1914 to 2.5% percent in 1927. [54] The drop was the result of the late Ottoman genocides , the population exchange between Greece and Turkey [ 55 ] and the emigration of Christians . [ 56 ]