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2 天前 · 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 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 with ...
2 天前 · Air pollution is the contamination of air due to the presence of substances called pollutants in the atmosphere that are harmful to the health of humans and other living beings, or cause damage to the climate or to materials. [1] It is also the contamination of the indoor or outdoor environment either by chemical, physical, or biological agents ...
1 天前 · BlackRock, Inc. is an American multinational investment company. It is the world's largest asset manager, with $10 trillion in assets under management as of December 31, 2023[update].[1] Headquartered in New York City, BlackRock has 78 offices in 38 countries, and clients in 100 countries. BlackRock is the manager of the iShares group of ...
2 天前 · Mikhail Sergeyevich Gorbachev (2 March 1931 – 30 August 2022) was a Soviet and Russian politician who served as the last leader of the Soviet Union from 1985 to the country's dissolution in 1991. He served as General Secretary of the Communist Party of the Soviet Union from 1985 and additionally as head of state beginning in 1988, as Chairman of the Presidium of the Supreme Soviet from 1988 ...
4 天前 · Bitcoin (abbreviation: BTC; sign: ) is the first decentralized cryptocurrency. Nodes in the peer-to-peer bitcoin network verify transactions through cryptography and record them in a public distributed ledger, called a blockchain, without central oversight. Consensus between nodes is achieved using a computationally intensive process based on proof of work, called mining, that guarantees the ...
2 天前 · Pyotr Ilyich Tchaikovsky. Pyotr Ilyich Tchaikovsky [n 1] ( / tʃaɪˈkɒfski / chy-KOF-skee; [2] 7 May 1840 – 6 November 1893) [n 2] was a Russian composer during the Romantic period. He was the first Russian composer whose music would make a lasting impression internationally. Tchaikovsky wrote some of the most popular concert and theatrical ...
3 天前 · The definition of terrorism lacks universal agreement. Challenges emerge due to the politically and emotionally charged nature of the term, and disagreement over the nature of terrorist acts and limits of the right to self-determination. Harvard law professor Richard Baxter, a leading expert on the law of war, was a skeptic: "We have cause to regret that a legal concept of 'terrorism' was ever ...
