Facts about carbon dating
Since its conception by Willard Libby in 1949, it has been invaluable to the discipline.
In fact, many important archaeological artifacts have been dated using this method including some of the Dead Sea Scrolls and the Shroud of Turin.
Amorphous carbon is formed when a material containing carbon is burned without enough oxygen for it to burn completely.
This black soot, also known as lampblack, gas black, channel black or carbon black, is used to make inks, paints and rubber products.
These two forms have identical physical properties but different crystal structures.
Stonehenge is a massive stone monument located on a chalky plain north of the modern-day city of Salisbury, England.
The procedure of radiocarbon dating can be used for remains that are up to 50,000 years old.
In fact, it has fluctuated a great deal over the years.
Most carbon atoms have six protons and six neutrons in their nuclei and are called carbon 12. But a tiny percentage of carbon is made of carbon 14, or radiocarbon, which has six protons and eight neutrons and is not stable: half of any sample of it decays into other atoms after 5,700 years.
Carbon 14 is continually being created in the Earth's atmosphere by the interaction of nitrogen and gamma rays from outer space.
Recent experiments show that it is possible for a one-ton stone to be moved by a dozen people on a wooden trackway, but whether this technique was actually used by the ancient builders is uncertain.
Scientists have also raised the possibility that during the last ice age glaciers carried these bluestones closer to the Stonehenge area and the monument's makers didn't have to move them all the way from Wales.