several colonies founded in New Zealand and Australia in the 1830s, 1840s and 1850s. In 1905, H.G. Wells published A Modern Utopia, which was widely read and admired and provoked much discussion. Also consider Eric Frank Russell's book The Great Explosion (1963), the last section of which details an economic and social utopia. This forms the first mention of the idea of Local Exchange Trading Systems (LETS). During the "Khrushchev Thaw" period, the Soviet writer Ivan Efremov produced the science-fiction utopia Andromeda (1957) in which a major cultural thaw took place: humanity communicates with a galaxy-wide Great Circle and develops its technology and culture within a social framework characterized by vigorous competition between alternative philosophies. The English political philosopher James Harrington (1611-1677), author of the utopian work The Commonwealth of Oceana, published in 1656, inspired English country-party republicanism (1680s to 1740s) and became influential in the design of three American colonies. His theories ultimately contributed to the idealistic principles of the American Founders. The colonies of Carolina (founded in 1670), Pennsylvania (founded in 1681), and Georgia (founded in 1733) were the only three English colonies in America that were planned as utopian societies with an integrated physical, economic and social design. At the heart of the plan for Georgia was a concept of "agrarian equality" in which land was allocated equally and additional land acquisition through purchase or inheritance was prohibited; the plan was an early step toward the yeoman republic later envisioned by Thomas Jefferson. The communes of the 1960s in the United States often represented an attempt to greatly improve the way humans live together in communities. The back-to-the-land movements and hippies inspired many to try to live in peace and harmony on farms or in remote areas and to set up new types of governance. Communes like Kaliflower, which existed between 1967 and 1973, attempted to live outside of society's norms and to create their own ideal communalist society. People all over the world organized and built intentional communities with the hope of developing a better way of living together. While many of these new small communities failed, some continue to grow, such as the religion-based Twelve Tribes, which started in the United States in 1972. Since its inception, it has grown into many groups around the world. Science and technology Though Francis Bacon's New Atlantis is imbued with a scientific spirit, scientific and technological utopias tend