The most difficult so­ci­ol­o­gy riddles

Jacques Derrida was a French philosopher best known for developing a form of semiotic analysis known as deconstruction, which he discussed in numerous texts, and developed in the context of phenomenology. He is one of the major figures associated with post-structuralism and postmodern philosophy.

Freeter is a Japanese expression for people who lack full-time employment or are unemployed, excluding housewives and students. The word freeter or freeta was first used around 1987 or 1988 and is thought to be a portmanteau of the English word free (or perhaps freelance) and the German word Arbeiter ("labourer").

Non-refoulement is a fundamental principle of international law that forbids a country receiving asylum seekers from returning them to a country in which they would be in likely danger of persecution based on "race, religion, nationality, membership of a particular social group or political opinion". Unlike political asylum, which applies to those who can prove a well-grounded fear of persecution based on certain category of persons, non-refoulement refers to the generic repatriation of people, including refugees into war zones and other disaster locales.