The Hainish Cycle consists of a number of science fiction novels and stories by Ursula K. Le Guin. It is set in an alternate history/future history in which civilizations of human beings on a number of nearby stars, including Terra (Earth), are contacting each other for the first time and establishing diplomatic relations, setting up a confederacy under the guidance of the oldest of the human worlds, peaceful Hain. In this history, human beings did not evolve on Earth but were the result of interstellar colonies planted by Hain long ago, which was followed by a long period when interstellar travel ceased. Some of the races have new genetic traits, a result of ancient Hainish experiments in genetic engineering, including people who can dream while awake, and a world of androgynous people who only come into active sexuality once a month, and can choose their gender. In keeping with Le Guin's style, she uses varied social and environmental settings to explore the anthropological and sociological outcomes of human evolution in those diverse environments.