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#3971
12-17-2018, 02:27 PM
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 The world’s first gold vending machine was unveiled in May 2010. Located in an ultra-luxury hotel in Abu Dhabi, the vending machine itself is covered in 24-carat gold. 
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#3972
12-17-2018, 02:30 PM
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 The most expensive gold coin in the world is the 1933 Double Eagle, which was sold at Sotheby's in New York in 2002 for $7.59 million.
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#3973
12-17-2018, 02:35 PM
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 South Dakota and Nevada produce more gold than any other states.
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#3974
12-17-2018, 02:42 PM
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 While the Nobel Prize medals are genuinely made of pure gold, the Olympic gold medals aren't: they are made of silver and then plated with a thin layer of gold. 
Last edited by Lee Stewart; 12-17-2018 at 02:51 PM.
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#3975
12-17-2018, 02:45 PM
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 We all know gold is rare, but let’s put that in perspective. The whole world pours more steel in a single hour than it has poured gold in recorded human history.
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#3976
12-17-2018, 02:49 PM
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 The easiest place to find lots of gold is probably not what you’d think. One can get more gold from one ton of personal computers than from seventeen tons of gold ore.
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#3977
12-17-2018, 02:57 PM
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 Silver is exceptionally shiny! It is the most reflective element, which makes it useful in mirrors, telescopes, microscopes and solar cells. Polished silver reflects 95% of the visible light spectrum. However, silver is a poor reflector of ultraviolet light.
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#3978
12-17-2018, 03:01 PM
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 Silver is the best electric conductor of the elements. It is used as the standard by which other conductors are measured. On a scale of 0 to 100, silver ranks 100 in terms of electrical conductivity. Copper ranks 97 and gold ranks 76.
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#3979
12-17-2018, 03:05 PM
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 Silver is the best thermal conductor of any metal. The lines you see in the rear window of a car consist of silver, used to defrost ice in the winter.
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#3980
12-17-2018, 03:22 PM
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 The most common form of silver is sterling silver. This is actually only 92.5% pure silver, with the other 7.5% made up of other precious metals including copper. Britannia silver is an alloy of 95.8% silver and 4.2% copper, also used for jewelry and silverware. Mexican silver is 95% silver and 5% copper. Fine silver is at least 99.9% pure and commercially available, but too soft for general use. There are 6 other classes of Silver (10 total)
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