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Salt was once as valuable as gold and used as currency. Here's how the two commodities diverged.
Sub-Saharan African merchants, including the Akan people of West Africa and the kingdom of Ghana, leveraged their access to ...
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Rhodium: Earth's Rarest and Most Expensive Precious Metal
Red salts are not typical of platinum ... he discovered two other precious metals. One he called palladium, and the other, rhodium. Rhodium is an ultra-shiny, corrosion resistant metal that ...