Skopje vs Cobalt

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Skopje ( SKOP-yee, -⁠yay, US also SKOHP-; Macedonian: Скопје [ˈskɔpjɛ] (listen); Albanian: Shkup) is the capital and largest city of North Macedonia. It is the country's political, cultural, economic, and academic centre. The territory of Skopje has been inhabited since at least 4000 BC; remains of Neolithic settlements have been found within the old Kale Fortress that overlooks the modern city centre. Originally a Paeonian city, Scupi became the capital of Dardania in the second century BC. On the eve of the 1st century AD, the settlement was seized by the Romans and became a military camp. When the Roman Empire was divided into eastern and western halves in 395 AD, Scupi came under Byzantine rule from Constantinople. During much of the early medieval period, the town was contested between the Byzantines and the Bulgarian Empire, whose capital it was between 972 and 992. From 1282, the town was part of the Serbian Empire, and acted as its capital city from 1346 to 1371. In 1392, Skopje was conquered by the Ottoman Turks, who called it Üsküb, with this name also being in use in English for a time. The town stayed under Ottoman control for over 500 years, serving as the capital of pashasanjak of Üsküp and later the Vilayet of Kosovo. In 1912, it was annexed by the Kingdom of Serbia during the Balkan Wars.

During the First World War the city was seized by the Kingdom of Bulgaria, and, after the war, it became part of the newly formed Kingdom of Yugoslavia as the capital of Vardarska Banovina. In the Second World War the city was again captured by Bulgaria and in 1944 became the capital of SR Macedonia, a federated state within the Yugoslavia. The city developed rapidly, but this trend was interrupted in 1963 when it was hit by a disastrous earthquake. Skopje is located on the upper course of the Vardar River, and is located on a major north–south Balkan route between Belgrade and Athens. It is a centre for metal-processing, chemical, timber, textile, leather, and printing industries. Industrial development of the city has been accompanied by development of the trade, logistics, and banking sectors, as well as an emphasis on the fields of transportation, culture and sport. According to the last official count from 2002, Skopje had a population of 428,988 inhabitants in its urban area and 506,926 in ten municipalities that form the city and, beside Skopje, include many other less urbanized and rural settlements some of which are located 20 kilometres away from the city itself or even border the neighbouring Kosovo.

Source: Wikipedia

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Cobalt is a chemical element with the symbol Co and atomic number 27. Like nickel, cobalt is found in the Earth's crust only in chemically combined form, save for small deposits found in alloys of natural meteoric iron. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal. Cobalt-based blue pigments (cobalt blue) have been used since ancient times for jewelry and paints, and to impart a distinctive blue tint to glass, but the color was later thought to be due to the known metal bismuth. Miners had long used the name kobold ore (German for goblin ore) for some of the blue-pigment-producing minerals; they were so named because they were poor in known metals, and gave poisonous arsenic-containing fumes when smelted. In 1735, such ores were found to be reducible to a new metal (the first discovered since ancient times), and this was ultimately named for the kobold. Today, some cobalt is produced specifically from one of a number of metallic-lustered ores, such as cobaltite (CoAsS). The element is, however, more usually produced as a by-product of copper and nickel mining.

The copper belt in the Democratic Republic of the Congo (DRC) and Zambia yields most of the global cobalt production. World production in 2016 was 116,000 metric tons (114,000 long tons; 128,000 short tons) (according to Natural Resources Canada), and the DRC alone accounted for more than 50%.Cobalt is primarily used in lithium-ion batteries, and in the manufacture of magnetic, wear-resistant and high-strength alloys. The compounds cobalt silicate and cobalt(II) aluminate (CoAl2O4, cobalt blue) give a distinctive deep blue color to glass, ceramics, inks, paints and varnishes. Cobalt occurs naturally as only one stable isotope, cobalt-59. Cobalt-60 is a commercially important radioisotope, used as a radioactive tracer and for the production of high-energy gamma rays. Cobalt is the active center of a group of coenzymes called cobalamins. Vitamin B12, the best-known example of the type, is an essential vitamin for all animals. Cobalt in inorganic form is also a micronutrient for bacteria, algae, and fungi.

Source: Wikipedia