One of the worst sounds you can hear is the smack of your prized possession hitting the concrete. You just know it has shattered, and you'll probably have to go out and buy a new one. No, I'm not ...
An array of powder-metal parts. Powder metallurgy was practiced long before ancient artisans learned to melt and cast iron. Egyptians made iron tools using PM techniques back in 3,000 B.C. The ancient ...
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