In J. K. Rowling's Harry Potter series, magic is depicted as a supernatural force that can be used to override the usual laws of nature. Many fictional magical creatures exist in the series, while ordinary creatures also sometimes exhibit magical properties. Magical objects are also described. Witches and wizards refer to the rest of the population, who are generally unaware of magic, as "Muggles" in the United Kingdom and "No-Maj" in the United States. In humans, magic or the lack thereof is an inborn attribute. It is usually inherited, carried on "dominant resilient genes". Magic is the norm for the children of magical couples and less common in those of Muggles. Exceptions exist: those unable to do magic who are born to magical parents are known as Squibs, whereas a witch or wizard born to Muggle parents is known as a Muggle-born, or by the derogatory term "Mudblood". While Muggle-borns are quite common, Squibs are extremely rare. Rowling based many magical elements of the Harry Potter universe on real-world mythology and magic. She has described this as "a way of giving texture to the world". The books present the idea that the Muggle interpretation of these stories is a distorted version of what goes on in the wizarding world. The magic of Harry Potter became the subject of a 2017 British Library exhibition and accompanying documentary. The exhibition, entitled Harry Potter: A History of Magic, is the first at the British Library to be inspired by a single series by a living author. Source: Wikipedia (en)