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The first world record in the men's 50 metres freestyle in long course (50 metres) swimming was recognized by the International Swimming Federation (FINA) in 1976.In short course (25 metres) swimming events the world's governing body recognizes world records since March 3, 1991.
Los Angeles, [a] often referred to by its initials L.A., is the most populous city in the U.S. state of California.With roughly 3.9 million residents within the city limits as of 2020, [7] It is the second-most populous city in the United States, behind only New York City; it is also the commercial, financial and cultural center of Southern California.
The earliest evidence of art was shell engravings made by Homo erectus 300,000 years before modern humans evolved. [370] Art attributed to H. sapiens existed at least 75,000 years ago, with jewellery and drawings found in caves in South Africa. [371] [372] There are various hypotheses as to why humans have adapted to the arts.
Copper is the 26th most abundant element in Earth's crust, representing 50 ppm compared with 75 ppm for zinc, and 14 ppm for lead. [28] Typical background concentrations of copper do not exceed 1 ng/m 3 in the atmosphere; 150 mg/kg in soil; 30 mg/kg in vegetation; 2 μg/L in freshwater and 0.5 μg/L in seawater. [29]
The European Union–Mercosur free trade agreement, which would form one of the world's largest free trade areas, has been denounced by environmental activists and indigenous rights campaigners. [83] The fear is that the deal could lead to more deforestation of the Amazon rainforest as it expands market access to Brazilian beef. [84]
Estimates of world population by their nature are an aspect of modernity, possible only since the Age of Discovery.Early estimates for the population of the world [10] date to the 17th century: William Petty, in 1682, estimated the world population at 320 million (current estimates ranging close to twice this number); by the late 18th century, estimates ranged close to one billion (consistent ...
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