From Frank Holmes of U.S. Global Investors:
Our interactive timeline traces gold's history back to its earliest origins but one question it doesn't answer is: Why gold? Why did our earliest ancestors choose gold over copper, neptunium or any other of the earth's elements as a form of currency?
The hosts of NPR's "Planet Money" set out to answer that question by breaking down the periodic table of elements. They sought the expert opinion of scientist Sanat Kumar, chair of Columbia University's chemical engineering department.
Kumar reveals the secret to gold's value as a currency is simple science. Here's his process...
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More on gold:
How to know if you own enough gold
The colossal force driving gold higher and higher
Why a runaway move in gold could be just around the corner
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