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This technique works well for materials up to around 50,000 years old.

Each radioactive isotope decays by a fixed amount, and this amount is called the half-life.

Libby was awarded the Nobel Prize in chemistry for his work in 1960.

Carbon dioxide in the atmosphere contains a constant amount of carbon-14, and as long as an organism is living, the amount of carbon-14 inside it is the same as the atmosphere.

This has caused many in the church to reevaluate the biblical creation account, specifically the meaning of the word “day” in Genesis 1.

Many people have been led to believe that radiometric dating methods have proved the earth to be billions of years old.

However, the principle of carbon-14 dating applies to other isotopes as well.

Potassium-40 is another radioactive element naturally found in your body and has a half-life of 1.3 billion years.

Whether for fun, love or companionship, people across the country are putting themselves out there in the hopes of meeting someone special.

We talk to six men and women aged from their 20s to 70s, to see how it's done.

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  1. He also treated Native Americans fairly, earning him the sobriquet “Box-Ka-Re-Sha-Hash-Ta-Ka”, meaning “Curly Haired White Chief Who Speaks with One Tongue,” a reference to his curly hair and also his straight, honest way of doing business.