Palindrome (; "again") and ' (; "way, direction"). Palindromes date back at least to 79 AD, as a palindrome was found as a graffito at Herculaneum, a city buried by ash in that year. This palindrome, called the Sator Square, consists of a sentence written in Latin: "Sator Arepo Tenet Opera Rotas" ("The sower Arepo holds with effort the wheels"). It is remarkable for the fact that the first letters of each word form the first word, the second letters form the second word, and so forth. Hence, it can be arranged into a word square that reads in four different
Correspondence principle (sociology) theory approach to sociology, which originated with Karl Marx. Marx's said that there is a social class division in capitalist society, between on the one hand a small percentage of the population who are capitalists, owning the means of production, and on the other workers, who sell their labor power to the capitalists. The correspondence principle advances a neo-Marxist argument about the specific nature of the institutional linkages in the family, school, and work "chain" comprising the socio- economic life cycle. Many sociologists who support this principle argue that education is just a means of maintaining social class boundaries. Many