Radiocarbon dating also referred to as carbon dating or carbon dating is a method for determining the age of an object containing organic material by using the properties of radiocarbon , a radioactive isotope of carbon. The method was developed in the late s at the University of Chicago by Willard Libby , who received the Nobel Prize in Chemistry for his work in It is based on the fact that radiocarbon 14 C is constantly being created in the atmosphere by the interaction of cosmic rays with atmospheric nitrogen. The resulting 14 C combines with atmospheric oxygen to form radioactive carbon dioxide , which is incorporated into plants by photosynthesis ; animals then acquire 14 C by eating the plants. When the animal or plant dies, it stops exchanging carbon with its environment, and thereafter the amount of 14 C it contains begins to decrease as the 14 C undergoes radioactive decay. Measuring the amount of 14 C in a sample from a dead plant or animal, such as a piece of wood or a fragment of bone, provides information that can be used to calculate when the animal or plant died.
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In her bluntest attack so far on the former SNP first minister his successor Ms Sturgeon accused him of launching Alba last Friday as part of a publicity campaign designed to boost his ego. The party will run on regional lists and look to secure a 'supermajority' in support of independence. But speaking to the Daily Record today, Ms Sturgeon said: 'I think he will be telling himself he is somehow advancing the independence cause but I think he is standing because he loves the limelight and can't bear not to be on the stage. SNP deputy first minister John Swinney shared a picture on Twitter on Friday showing him on a street with four other party activists, ahead of the parliamentary elections on May 6. A recent article titled 'The outstanding scientist, R. A Fisher: his views on eugenics and race' called for the era in which Sir Ronald Aylmer Fisher wrote to be considered before criticising him. Mother-of-two Annemarie from Glasgow bought the Pomeranian crossbreed puppy Angus online as a present for her daughters, aged six and 11 years old.
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Several National Library of Scotland catalogues, indexes and databases are available online to help you find items in our collections. Library Search replaced the main catalogue on 29 October Over four million records from the main catalogue are now available through a single search alongside details of manuscript and archives, moving image and digital collections, and electronic publications and databases.
Known as the "Apostle of Ireland", he is the primary patron saint of Ireland, the other patron saints being Brigit of Kildare and Columba. Patrick was never formally canonised ,  having lived prior to the current laws of the Catholic Church in these matters. Nevertheless, he is venerated as a Saint in the Catholic Church and in the Eastern Orthodox Church , where he is regarded as equal-to-the-apostles and Enlightener of Ireland. He is also regarded as a Saint within the framework of their respective doctrine by the Anglican Communion and the Lutheran Churches.