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Is your dime worth millions of dollars? Here’s how to tell
Another Barber dime sold in 2020 for $1.5 million, according to the company’s website. The same coin went for $1.035 million ...
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The United States’ oldest known rock has existed for at least 3.6 billion years
A weathered sign in the Minnesota River Valley proudly proclaims: “World’s Oldest Rock.” Erected in 1975, it marks a 3.8-billion-year-old gneiss — or so scientists thought.