Marx Brothers "The Cocoanuts" (1925–1926) and "Animal Crackers" (1928–1929). Playwright George S. Kaufman worked on the last two and helped sharpen the brothers' characterizations. Out of their distinctive costumes, the brothers looked alike, even down to their receding hairlines. Zeppo could pass for a younger Groucho, and played the role of his son in "Horse Feathers". A scene in "Duck Soup" finds Groucho, Harpo, and Chico all appearing in the famous greasepaint eyebrows, mustache, and round glasses while wearing nightcaps. The three are indistinguishable, enabling them to carry off the "mirror scene" perfectly. The stage names of the brothers (except Zeppo) were
Influences on Karl Marx social Darwinism. Nonetheless, it is evident that Marx had a strong liking for Darwin's theory and a clear influence on his thought. Furthermore, when the second German edition of "Das Capital", was published (two years after the publication of Darwin's "Descent of Man, and Selection in Relation to Sex"), Marx sent Darwin a copy of his book with the following words: Darwin wrote back to Marx in October, thanking him for having sent his work and saying "I believe that we both earnestly desire the extension of knowledge". According to scholar Paul Heyer, "Marx believed that Darwin provided a materialistic