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Research has been ongoing since the 1960s to determine what the proportion of in the atmosphere has been over the past fifty thousand years.The resulting data, in the form of a calibration curve, is now used to convert a given measurement of radiocarbon in a sample into an estimate of the sample's calendar age.The older a sample is, the less (the period of time after which half of a given sample will have decayed) is about 5,730 years, the oldest dates that can be reliably measured by this process date to around 50,000 years ago, although special preparation methods occasionally permit accurate analysis of older samples.The idea behind radiocarbon dating is straightforward, but years of work were required to develop the technique to the point where accurate dates could be obtained.Libby and James Arnold proceeded to test the radiocarbon dating theory by analyzing samples with known ages.For example, two samples taken from the tombs of two Egyptian kings, Zoser and Sneferu, independently dated to 2625 BC plus or minus 75 years, were dated by radiocarbon measurement to an average of 2800 BC plus or minus 250 years. Carbon dioxide produced in this way diffuses in the atmosphere, is dissolved in the ocean, and is taken up by plants via photosynthesis.Khalifa also came under fire for her tattoos she has relating to Lebanon, including the opening line of the Lebanese national anthem and a tattoo of the Lebanese Forces Cross, which she said was to "show solidarity with my father's political views after a bombing in Lebanon in 2012”.In an interview with Newsweek, Khalifa said her critics were accusing her of shaming Lebanon by appearing in adult films with such a tattoo on her body.

In addition to permitting more accurate dating within archaeological sites than previous methods, it allows comparison of dates of events across great distances.

The method was developed by Willard Libby in the late 1940s and soon became a standard tool for archaeologists.

Libby received the Nobel Prize in Chemistry for his work in 1960.

Khalifa has since been re-tweeting the abuse sparked by those taking issue with her Middle Eastern origins – some of which included death threats.

Many took issue with a scene from one of her videos showing her wearing a hijab, a part of traditional female Muslim dress, describing it as “problematic and gross”.

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