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The common cold or the cold is a viral infectious disease of the upper respiratory tract that primarily affects the respiratory mucosa of the nose, throat, sinuses, and larynx. [6] [8] Signs and symptoms may appear in as little as two days after exposure to the virus. [6] These may include coughing, sore throat, runny nose, sneezing, headache ...
World Book Encyclopedia. The World Book Encyclopedia is an American encyclopedia. [1] World Book was first published in 1917. Since 1925, a new edition of the encyclopedia has been published annually. [1] Although published online in digital form for a number of years, World Book is currently the only American encyclopedia which also still ...
The Köppen climate classification is one of the most widely used climate classification systems. It was first published by German-Russian climatologist Wladimir Köppen (1846–1940) in 1884, [1] [2] with several later modifications by Köppen, notably in 1918 and 1936. [3] [4] Later, German climatologist Rudolf Geiger (1894–1981) introduced ...
A February 2023 review of the four common cold coronaviruses concluded that the virus would become seasonal and, like the common cold, cause less severe disease for most people. As of 2023 the transition to endemic COVID-19 may take years or decades. Long-term effects Economic
Climate change threatens people with increased flooding, extreme heat, increased food and water scarcity, more disease, and economic loss. Human migration and conflict can also be a result. [13] The World Health Organization (WHO) calls climate change the greatest threat to global health in the 21st century. [14]
The Hajj and Umrah attract large numbers of Muslim devotees from all over the world to Mecca and Medina. Iran is the largest Shi'a country. The Druze Faith or Druzism originated in West Asia, is a monotheistic religion based on the teachings of figures like Hamza ibn-'Ali ibn-Ahmad and Al-Hakim bi-Amr Allah , and Greek philosophers such as ...
ET. In physical geography, tundra ( / ˈtʌndrə, ˈtʊn -/) is a type of biome where tree growth is hindered by frigid temperatures and short growing seasons. The term is a Russian word adapted from Sámi languages. [2] There are three regions and associated types of tundra: Arctic tundra, [3] alpine tundra, [3] and Antarctic tundra.
The current world population growth is approximately 1.09%. People under 15 years of age made up over a quarter of the world population (25.18%), and people age 65 and over made up nearly ten percent (9.69%) in 2021. The world population more than tripled during the 20th century from about 1.65 billion in 1900 to 5.97 billion in 1999.