Khan Academy
Khan Academy: Jade Ornament for the Top of an Axe Shaft (Neolithic China)
Graves of the Hongshan culture (about 3800-2700 B.C.E.) might have held as many as 20 jade artifacts while those of the Liangzhu culture (about 3000--2000 B.C.E.) had as many as 300. These included bead necklaces and other decorative...