According to foreign media reports, diamonds are forever and gold is precious, but which one is rarer? Is their rarity proportional to the price of jewelry in a jewelry store? In fact, the answer may not be as obvious as you might think. Gold, a heav…
Under the spread of the new crown epidemic, after Americans experienced life and death, they set off the largest "resignation wave" in history, and the number of resignations broke the highest record since statistics began in 2000. Since April this y…
The Spherical Copper Coated Tungsten Powder, which is grey black in chemical formula, may be used for both industrial and commercial purposes. Submicron, nanopowder, and Cu-W forms of the powder are also available. Information about 3D Printing…