Utopian rationalism names the belief that science has made utopia a practical possibility. Its characteristics include determinism, collectivism, distrust of individual initiative and belief in the superiority of collective planning in securing human happiness. The first section traces the utopian and dystopian tradition into modern science fiction. The ideas collected here are systematized in the next section, which on all points dismisses the tenets and claims of utopian rationalism as false, and in a final section, which discusses utopian thinking and (...) its dangers in general. Utopian thinking is traced to three traits of human nature, namely, the quests for happiness, perfection, and submergence. (shrink)