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A child mummy is found high in the Andes and the archaeologist says the child lived more than 2,000 years ago.How do scientists know how old an object or human remains are?Having started smoking as a teenager, Professor Robert West managed to kick the habit while at university, on a girlfriend’s urging.He has gone on to devote his 30-year career to discovering what works when it comes to giving up smoking.Archaeologists use the exponential, radioactive decay of carbon 14 to estimate the death dates of organic material.The stable form of carbon is carbon 12 and the radioactive isotope carbon 14 decays over time into nitrogen 14 and other particles.The article is in straightforward language and the non-technical reader could profitably work through it., we find that this ration is the same if we sample a leaf from a tree, or a part of your body.

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Note that over the entire record, CO2 saturation levels have rarely dropped in a current month comparison to same month in the previous year.West advises how to combine these ingredients into a personalised “formula”. You smoke because the nicotine you have been inhaling for all those years has changed your brain chemistry to create powerful urges to smoke.

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