1) J.K. Rowling's "Harry Potter" series of books has sold over 500 million copies worldwide and has been translated into 80 languages.

2) Celtic mythology encompasses the folklore and legends of the Celtic peoples across Europe, particularly in regions like Ireland, Scotland, and Wales. It features deities like Morrigan, Cernunnos, and Brigid, and delves into themes of nature, magic, and the heroic exploits of legendary figures like Cu Chulainn.

3) Political ideologies such as liberalism, conservatism, socialism, and communism shape and influence policies, governance, and societal values in different countries and contexts.

4) The Cannes Film Festival, held annually in France, is one of the most prestigious film festivals in the world.