Colin renfrew radiocarbon 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.
After the war he became very interested in peaceful applications of atomic science.
"Everything which has come down to us from heathendom is wrapped in a thick fog; it belongs to a space of time we cannot measure.
Libby later received the Nobel Prize in Chemistry in 1960 for the radiocarbon discovery.
Today, there are over 130 radiocarbon dating laboratories around the world producing radiocarbon dates for the scientific community.
It is called 'radio'-carbon, because it is 'radioactive'.
This means that its atomic structure is not stable and there is an uneasy relationship between the particles in the nucleus of the atom itself.