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For example, during the reign of Han Cho Ti (86-74 B.C.) there were more than 500,000 mows of irrigated farmlands around Luntai (Lun-dai) and Yuli (Werli) cities in the lower reaches of the Tarim River.…Thus, the ancient extensive farmlands around Luntai and Yuli have now been all turned into shifting sands, and the famous ancient Loulan Kingdom, located at the western side of Lop Nur, has been utterly devastated into a wild landscape of yardang and barchan dunes.

(b) What is the least dimension, if any, in which a simplex can be unistable? If the condition of uniform density of material is relaxed, then a simplex can be unistable in 3 dimensions.

Sit still, my daughter, until thou know how the matter will fall.