An economically important source of nickel is the iron ore limonite, which often contains 1вЂ“2% nickel. The element's name comes from a mischievous sprite of German miner mythology, Nickel (similar to Old Nick), who personified the fact that copper-nickel ores resisted refinement into copper. Nickel was first isolated and classified as a chemical element in 1751 by Axel Fredrik Cronstedt, who initially mistook the ore for a copper mineral, in the cobalt mines of Los, HГ¤lsingland, Sweden. Use of nickel (as a natural meteoric nickelвЂ“iron alloy) has been traced as far back as 3500В BCE. An ironвЂ“nickel mixture is thought to compose Earth's outer and inner cores. Meteoric nickel is found in combination with iron, a reflection of the origin of those elements as major end products of supernova nucleosynthesis. Even so, pure native nickel is found in Earth's crust only in tiny amounts, usually in ultramafic rocks, and in the interiors of larger nickelвЂ“iron meteorites that were not exposed to oxygen when outside Earth's atmosphere. Pure nickel, powdered to maximize the reactive surface area, shows a significant chemical activity, but larger pieces are slow to react with air under standard conditions because an oxide layer forms on the surface and prevents further corrosion (passivation).

Nickel belongs to the transition metals and is hard and ductile. It is a silvery-white lustrous metal with a slight golden tinge. Nickel is a chemical element with the symbol Ni and atomic number 28. The triangles and squares identify the North-South polarity of one of their embedded magnets. Panel shapes include two types of interlocking triangles, interlockable squares, and circle or disks. The bars with magnets at each end are 27В mm (1.1В in) long, or 68В mm (2.7В in), or 53В mm (2.1В in) and flexible, or short rigid curves. The spheres are 0.588В in (14.9В mm) to 0.593В in (15.1В mm) in diameter (larger than Geomag), approximately 27.8В g (0.98В oz) in weight, and are prone to surface corrosion, unlike most other magnetic construction toys. Designed to be a cheaper version of the Geomag magnetic construction set, Magnetix's image suffered severely when an early manufacturing defect caused a death, and was subsequently sold under several different brands after the defect was corrected. Magnetix is a magnetic construction toy consisting of a combination of plastic building pieces containing embedded neodymium magnets, and steel bearing balls that can be connected to form geometric shapes and structures. Through biological evolution, sense organs and feeding structures also concentrate into the anterior region these collectively form the head. In bilaterally symmetrical animals, nervous tissues concentrate at the anterior region, forming structures responsible for information processing. Heads develop in animals by an evolutionary trend known as cephalization. Some very simple animals may not have a head, but many bilaterally symmetric forms do, regardless of size.

Interpersonal attraction, a part of social psychologyДЄ head is the part of an organism which usually includes the ears, brain, forehead, cheeks, chin, eyes, nose, and mouth, each of which aid in various sensory functions such as sight, hearing, smell, and taste, respectively.

Physical attractiveness, personal features considered aesthetically pleasing or beautiful.

Alfa Romeo 75, a car produced by Alfa Romeo.

Highway 75, see List of highways numbered 75.M75 (disambiguation), including 'Model 75'.It is a composite number and the smallest perfect number. 6 ( six) is the natural number following 5 and preceding 7.

Moen magnetix shower head