Why Wedding Rings Are Usually Made of Gold?
Why Wedding Rings Are Usually Made of Gold? The modern custom of wearing gold wedding rings originated in Roman times, but the idea took many centuries to become...
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How Are Copper Pipes Made?
How Are Copper Pipes Made? Copper pipes are made by pushing a long cylinder of the metal, called a billet, through a machine that has a rod in the centre of a hollow...
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When Does Copper Turn Green?
When Does Copper Turn Green? Although copper is highly resistant to the chemical action of the atmosphere and of sea water, it turns green if exposed to them for a long...
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What Is a Meteorite?
What Is a Meteorite? Meteorites begin as bodies of matter traveling at great speed through space. In the solar system there are numberless such bodies, usually chunks...
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Where Is Cobalt Used?
Where Is Cobalt Used? Can you think of any connection between a delicate Ming vase and a nuclear explosion? Difficult, isn’t it? And yet there is a connection in the...
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