Wang Chong (; 27 – c. 97 AD), courtesy name Zhongren (仲任), was a Chinese astronomer, meteorologist, naturalist, philosopher, and writer active during the Han Dynasty. He developed a rational, secular, naturalistic and mechanistic account of the world and of human beings and gave a materialistic explanation of the origin of the universe. His main work was the Lunheng (論衡, "Critical Essays"). This book contained many theories involving early sciences of astronomy and meteorology, and Wang Chong was even the first in Chinese history to mention the use of the square-pallet chain pump, which became common in irrigation and public works in China thereafter. Wang also accurately described the process of the water cycle. Unlike most of the Chinese philosophers of his period, Wang spent much of his life in non-self-inflicted poverty. He was said to have studied by standing at bookstalls, and had a superb memory, which allowed him to become very well-versed in the Chinese classics. He eventually reached the rank of District Secretary, a post he soon lost as a result of his combative and anti-authoritarian nature. Life Wang was born into a poor family in modern Shangyu, Zhejiang. Born a son of Wang Song, he was admired in his local community for his filial piety and devotion to his father. With the urging of his parents, Wang travelled to the Eastern Han capital at Luoyang to study at the Imperial University. It was there that Wang became acquainted with the prestigious historian Ban Biao (3–54), the latter who initiated the Book of Han. He also befriended Ban Gu (32–92), the son of Ban Biao who made further contributions to the Book of Han. Since he was poor and lacked enough money to purchase proper texts of study, Wang had to resort to frequent visits to bookshops to acquire knowledge. Rafe de Crespigny writes that during his studies Wang was most likely influenced by contemporary Old Text realists such as Huan Tan (d. 28). Due to his humble origins, Wang became resentful of officials who were admired simply because of their wealth and power and not for any scholarly abilities. Wang returned to his home commandery where he became a local teacher. He was elevated as an Officer of Merit, but due to his critical and quarrelsome nature he decided to resign from this position. Following this was a period of isolated retirement when Wang composed essays