[TheJogdredge] has been testing out his new gold washing machines that he made at home. By running dirt laced with rocks through this trommel, gold and precious materials can be filtered out.

in which condition it is employed as a gold wash for steel instruments. By dipping a polished steel instrument into an ethereal solution of gold, on the evaporation of the ether, the metal is ...

Scientific American is part of Springer Nature, which owns or has commercial relations with thousands of scientific publications (many of them can be found at www ...

The Australian government has set a standard definition of a local business, in order to better understand how much of the government's $70 billion annual spend is with local firms. Federal ...