Carbon dating has a certain margin of error, usually depending on the age and material of the sample used.
Carbon-14 has a half-life of about 5730 years, and therefore it is used to date biological samples up to about 60,000 years in the past.
The effort to compile 300,000 entries that span science, literature, politics and history is being led by the ruling Communist Party's central propaganda department, which guides public opinion through instructions to China's media, internet companies and publishing industry as well as overseeing the education sector.
They have instructed the Encyclopaedia of China Publishing House, known for its offline Chinese Encyclopaedia, to produce it.
As early as 30,000 years ago, we can also see evidence of some experimentation with clay: at a site known as Dolni Vestonice (Czech Republic), figurines made of clay mixed with crushed mammoth bone were found.
The scholars say truth is their guiding light, and their editing and review process is a rigorous one.
Because usable clay is widely available, pottery was independently invented in many parts of the world at different times.
The earliest recorded evidence of clay usage dates back to the Late Palaeolithic period in central and western Europe, where fired and unfired clay figurines were created as a form of artistic expression.
Pottery is the first synthetic material ever created by humans.
The term refers to objects made of clay that have been fashioned into a desire shape, dried, and either fired or baked to fix their form.