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Below are our experts' reviews of the top online dating sites for black singles, based on the size of each site's user base, success rate, ease of use, safety and other factors. Dating is a free online resource that offers valuable content and comparison services to users.To keep this resource 100% free for users, we receive advertising compensation from the sites listed on this page.As a rule, carbon dates are younger than calendar dates: a bone carbon-dated to 10,000 years is around 11,000 years old, and 20,000 carbon years roughly equates to 24,000 calendar years.

Climate records from a Japanese lake are set to improve the accuracy of the dating technique, which could help to shed light on archaeological mysteries such as why Neanderthals became extinct.

Carbon dating is used to work out the age of organic material — in effect, any living thing.

By measuring the ratio of the radio isotope to non-radioactive carbon, the amount of carbon-14 decay can be worked out, thereby giving an age for the specimen in question.

But that assumes that the amount of carbon-14 in the atmosphere was constant — any variation would speed up or slow down the clock.

Various geologic, atmospheric and solar processes can influence atmospheric carbon-14 levels.