Nephrite as a surface treatment. A lot of nephrite tools and amulets are known since the Early Neolithic (VII mill. BC) to the Late Chalcolithic (V mill. BC) on the Balkans (mainly Bulgaria; also in Greece, Serbia, Croatia) from two or more unknown sources - Balkan "nephrite culture". Such tools are found in the Later Neolithic of Poland (from the most probable local source Jordanów), Sardinia (Italy) (unknown source) and Switzerland (Kostov, 2005; 2013). Single or just a few finds of nephrite artifacts are reported also from some other European countries. During Neolithic times, the key known sources of nephrite jade
The First Series of Standardized Forms of Words with Non-standardized Variant Forms only three times in the "People's Daily" between 1995 and 2000. The Ministry of Education of the People's Republic of China has called on teachers throughout China to use and teach the forms recommended in "The First Series of Standardized Forms of Words with Non-standardized Variant Forms". Before March 31, 2005, a student's use of one of the variant written forms not recommended in the "First Series" on a test like Gaokao would not influence points earned on a given question. Implementation of the Ministry's policy is not to influence the usage of variant written forms in research on ancient