Couple of fish dating
During the period of a plant's life, the plant is taking in carbon dioxide through photosynthesis, which is how the plant makes energy and grows.Animals eat plants, and some eat other animals in the food chain.We know that it is older than Christendom, but whether by a couple of years or a couple of centuries, or even by more than a millenium, we can do no more than guess." [Rasmus Nyerup, (Danish antiquarian), 1802 (in Trigger, 19)].The person who wrote these words lived in the 1800s, many years before archaeologists could accurately date materials from archaeological sites using scientific methods.After twice that time (about 11000 years), another half of that remaining amount will have disappeared.After another 5568 years, again another half will have disappeared.The radiocarbon method was developed by a team of scientists led by the late Professor Willard F.Libby of the University of Chicago after the end of World War 2.
He and two students first measured the "half-life" of radiocarbon.
It is called 'radio'-carbon, because it is 'radioactive'.