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The Manchu (Manchu: manjU; Mollendorff: manju; Abkai: manju; simplified Chinese: Man Zu ; traditional Chinese: Man Zu ; pinyin: Manzu; Wade-Giles: Man3-tsu2) are an ethnic minority in China and the people from whom Manchuria derives its name. They are sometimes called "red-tasseled Manchus", a reference to the ornamentation on traditional Manchu hats. The Later Jin (1616-1636), and Qing dynasty (1636-1912) were established by Manchus, who are descended from the Jurchen people who earlier established the Jin dynasty (1115-1234) in China. Manchus form the largest branch of the Tungusic peoples and are distributed throughout China, forming the fourth largest ethnic group in the country.
Octagonal drum is a type of Manchu folk art that was very popular among bannermen, especially in Beijing. It is said that octagonal drum originated with the snare drum of the Eight-banner military and the melody was made by the banner soldiers who were on the way back home from victory in the battle of Jinchuan. The drum is composed of wood surrounded by bells. The drumhead is made by wyrmhide with tassels at the bottom. The colors of the tassels are yellow, white, red, and blue, which represent the four colors of the Eight Banners. When artists perform, they use their fingers to hit the drumhead and shake the drum to ring the bells. Traditionally, octagonal drum is performed by three people. One is the harpist; one is the clown who is responsible for harlequinade; and the third is the singer.  "Zidishu" is the main libretto of octagonal drum and can be traced back to a type of traditional folk music called the "Manchu Rhythm". Although Zidishu was not created by Han Chinese, it still contains many themes from Chinese stories, such as Romance of the Three Kingdoms, Dream of the Red Chamber, Romance of the West Chamber, Legend of the White Snake and Strange Stories from a Chinese Studio. Additionally, there are many works that depict the lives of Bannermen. Aisin Gioro Yigeng, who was pen named "Helu" and wrote the sigh of old imperial bodyguard, as the representative author. Zidishu involves two acts of singing, which are called dongcheng and xicheng.  After the fall of the Qing dynasty, the influence of the octagonal drum gradually reduced. However, the Chinese monochord and crosstalk which derived from octagonal are still popular in Chinese society and the new generations. Many famous Chinese monochord performers and crosstalkers were the artists of octagonal drum, such as De Shoushan and Zhang Sanlu.
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Is it a musical instrument?

Answer:
It is said that octagonal drum originated with the snare drum of the Eight-banner military and the melody was made by the banner soldiers


Question:
Richard Charles "Dick" Lewontin (born March 29, 1929) is an American evolutionary biologist, mathematician, geneticist, and social commentator. A leader in developing the mathematical basis of population genetics and evolutionary theory, he pioneered the application of techniques from molecular biology, such as gel electrophoresis, to questions of genetic variation and evolution. In a pair of seminal 1966 papers co-authored with J.L. Hubby in the journal Genetics, Lewontin helped set the stage for the modern field of molecular evolution. In 1979 he and Stephen Jay Gould introduced the term "spandrel" into evolutionary theory.
Along with others, such as Gould, Lewontin has been a persistent critic of some themes in neo-Darwinism. Specifically, he has criticised proponents of sociobiology and evolutionary psychology such as Edward O. Wilson and Richard Dawkins, who attempt to explain animal behaviour and social structures in terms of evolutionary advantage or strategy. He and others criticize this approach when applied to humans, as he sees it as genetic determinism. In his writing, Lewontin suggests a more nuanced view of evolution is needed, which requires a more careful understanding of the context of the whole organism as well as the environment.  Such concerns about what he views as the oversimplification of genetics has led Lewontin to be a frequent participant in debates, and an active life as a public intellectual. He has lectured widely to promote his views on evolutionary biology and science. In books such as Not in Our Genes (co-authored with Steven Rose and Leon J. Kamin) and numerous articles, Lewontin has questioned much of the claimed heritability of human behavioral traits, such as intelligence as measured by IQ tests.  Some academics have criticized him for rejecting sociobiology for non-scientific reasons. Edward Wilson (1995) suggested that Lewontin's political beliefs affected his scientific view. Robert Trivers described Lewontin as "...a man with great talents who often wasted them on foolishness, on preening and showing off, on shallow political thinking and on useless philosophical rumination while limiting his genetic work by assumptions congenial to his politics." Lewontin has at times identified himself as Marxist, and admitted that his ideological views have affected his scientific work (Levins and Lewontin 1985). Others such as Kitcher (1985) have countered that Lewontin's criticisms of sociobiology are genuine scientific concerns about the discipline. He wrote that attacking Lewontin's motives amounts to an ad hominem argument.
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Who has he worked with?

Answer:
Lewontin has at times identified himself as Marxist, and admitted that his ideological views have affected his scientific work (Levins and Lewontin 1985).