Cobalt vs Toruń

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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

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Toruń (UK: , US: , Polish: [ˈtɔruj̃] (listen); German: Thorn) is a historical city on the Vistula River in north-central Poland, and a UNESCO World Heritage Site. Its population was 201,447 as of December 2019. Previously, it was the capital of the Toruń Voivodeship (1975–1998) and the Pomeranian Voivodeship (1921–1945). Since 1999, Toruń has been a seat of the self-government of the Kuyavian-Pomeranian Voivodeship and, as such, is one of its two capitals, together with Bydgoszcz. The cities and neighboring counties form the Bydgoszcz–Toruń twin city metropolitan area. Toruń is one of the oldest cities in Poland, with the first settlement dated back to the 8th century and later having been expanded in 1233 by the Teutonic Knights. Over centuries, it was the home for people of diverse backgrounds and religions. From 1264 until 1411 Toruń was part of the Hanseatic League and by the 17th century it was one of the elite trading points, which greatly affected the city's architecture ranging from Brick Gothic to Mannerism and Baroque.

In the early-modern age, Toruń was a royal city of Poland and it was one of the four largest cities in the country at the time. After the partitions of Poland it was part of Prussia and later the German Empire. After Poland regained independence in 1918, Toruń was reincorporated into Polish territory, and during World War II was spared from bombing and destruction. This allowed the Old Town to be fully preserved with its iconic central marketplace.Believed to be one of the most beautiful cities in Europe, Toruń is renowned for the Museum of Gingerbread, whose baking tradition dates back nearly a millennium, and its large Cathedral. Toruń is noted for its very high standard of living and quality of life. In 1997 the medieval part of the city was designated a UNESCO World Heritage Site. In 2007 the Old Town in Toruń was added to the list of Seven Wonders of Poland. Toruń is the birthplace of astronomer Nicolaus Copernicus.

Source: Wikipedia