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Kabul (Pashto: کابل, romanized: Kābəl; Dari: کابل, romanized: Kābol) is the capital and largest city of Afghanistan, situated in the eastern section of the country. It is also a municipality, forming part of the greater Kabul Province, and divided into 22 districts. Based on estimates in 2020, the population of Kabul is 4.222 million, which includes all the significant ethnic groups of Afghanistan. Afghanistan's only city with a population of over 1 million, Kabul serves as its political, cultural and economical center. Rapid urbanization has made Kabul the world's 75th biggest city.Kabul is situated high up in a narrow valley between the Hindu Kush mountains, with an elevation of 1,790 metres (5,873 ft) making it one of the greatest capitals in the world. The city is said to be over 3,500 years old, said since at the time of the Achaemenid Empire. Located at crossroads in Asia - approximately halfway between Istanbul in the west and Hanoi in the east - it's in a strategic location along the trade routes of South and Central Asia, and a key location of the historical Silk Road. It has been part of the Achaemenids followed by the Seleucids, Mauryans, Kushans, Kabul Shahis, Saffarids, Samanids, Ghaznavids, Ghurids, Khwarazmians, Qarlughids, Khaljis, Timurids, Mughals, and Hotaks, until eventually becoming part of the Durrani Empire (also known as the"Afghan Empire") in 1747.
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Green is the color between blue and yellow on the visible spectrum. It is evoked by light which has a dominant wavelength of roughly 495–570 nm. In subtractive color systems, used in painting and color printing, it is created by a combination of yellow and blue, or yellow and cyan; in the RGB color model, used on television and computer screens, it is one of the additive primary colors, along with red and blue, which are mixed in different combinations to create all other colors. By far the largest contributor to green in nature is chlorophyll, the chemical by which plants photosynthesize and convert sunlight into chemical energy. Many creatures have adapted to their green environments by taking on a green hue themselves as camouflage. Several minerals have a green color, including the emerald, which is colored green by its chromium content.
During post-classical and early modern Europe, green was the color commonly associated with wealth, merchants, bankers and the gentry, while red was reserved for the nobility. For this reason, the costume of the Mona Lisa by Leonardo da Vinci and the benches in the British House of Commons are green while those in the House of Lords are red.