The color of a kittenâs fur can give clues to its sex. Certain colors, like calico (large patches of black, white, and orange) and tortoiseshell (marbled black, orange/brown, and sometimes white), are carried on the X chromosome and require two X chromosomes to appear.
Tungsten, also known as wolfram, is a chemical element with the chemical symbol W and atomic number 74. The word tungsten comes from the Swedish language tung sten directly translatable to heavy stone, though the name is volfram in Swedish to distinguish it from Scheelite, in Swedish alternatively named tungsten.
Tungsten (atomic number 74, symbol W) is a metal and chemical element that was discovered in 1781 by the Swedish mineralogist and chemist Torbern Bergman. It was in 1783 when the element was isolated for the first time. Fausto Elhuyar and Juan Jose Elhuyar isolated tungsten from wolframite. Properties and Radioisotopes.