In cultural anthropology and cultural geography, cultural diffusion, as first conceptualized by Alfred L. Kroeber in his influential 1940 paper Stimulus Diffusion, or trans-cultural diffusion in later reformulations, is the spread of cultural items—such as ideas, styles, religions, technologies, languages etc.—between individuals, whether within a single culture or from one culture to another. It is distinct from the diffusion of innovations within a single culture.

Diffusion across cultures is a well-attested and also uncontroversial phenomenon. For example, the practice of agriculture is widely believed to have diffused from somewhere in the Middle East to all of Eurasia, less than 10,000 years ago, having been adopted by many pre-existing cultures. Other established examples of diffusion include the spread of the war chariot and iron smelting in ancient times, and the use of cars and Western business suits in the 20th century.

Inter-cultural diffusion can happen in many ways. Migrating populations will carry their culture with them. Ideas can be carried by trans-cultural visitors, such as merchants, explorers, soldiers, diplomats, slaves, and hired artisans. Technology diffusion has often occurred by one society luring skilled scientists or workers by payments or other inducement. Trans-cultural marriages between two neighboring or interspersed cultures have also contributed. Among literate societies, diffusion can happen through letters or books (and, in modern times, through other media as well).

Jean Baudrillard (27 July 1929 – 6 March 2007) (French pronunciation: [ʒɑ̃ bodʁijaʁ]) was a French sociologist, philosopher, cultural theorist, political commentator, and photographer. His work is frequently associated with postmodernism and specifically post-structuralism.

Baudrillard was born in Reims, northeastern France, on July 27, 1929. He told interviewers that his grandparents were peasants and his parents were civil servants. During his high school studies at the Reims Lycée, he came into contact with pataphysics (via the philosophy professor Emmanuel Peillet), which is said to be crucial for understanding Baudrillard's later thought. He became the first of his family to attend university when he moved to Paris to attend Sorbonne University. There he studied German language and literature, which led to him to begin teaching the subject at several different lycées, both Parisian and provincial, from 1960 until 1966. While teaching, Baudrillard began to publish reviews of literature and translated the works of such authors as Peter Weiss, Bertolt Brecht, Karl Marx, Friedrich Engels, and Wilhelm Emil Mühlmann.

Robert Barnard (born 23 November 1936) is an English crime writer, critic and lecturer.

Born in Essex, Barnard was educated at the Colchester Royal Grammar School and at Balliol College in Oxford. His first crime novel, A Little Local Murder, was published in 1976. The novel was written while he was a lecturer at University of Tromsø in Norway. He has gone on to write more than 40 other books and numerous short stories.

Barnard has said that his favourite crime writer is Agatha Christie. In 1980 he published a critique of her work titled A Talent to Deceive: An Appreciation of Agatha Christie.

Barnard was awarded the Cartier Diamond Dagger in 2003 by the Crime Writers Association for a lifetime of achievement.

Under the pseudonym Bernard Bastable, Robert Barnard has published one standalone novel and three alternate history books starring Wolfgang Mozart as a detective, he having survived to old age.

Barnard and his wife Louise live in Yorkshire.