George Tucker wrote A Voyage to the Moon: with Some Account of the Manners and Customs, Science and Philosophy, of the People of Morosofia, and other Lunarians . A Voyage to the Moon was one of the earliest attempts at science fiction by an American author. Tucker is one of the first to use the concept of anti-gravity in this depiction of the effects of lesser gravity "I was astonished at first at this seeming increase in my muscular powers; when on passing along a street…and meeting a dog, which I thought to be mad, I proposed to run out of its way, and in leaping over a gutter, I fairly bounded across the street." The chapters on the history of Okalbia, the Happy Valley are of interest for the method of preventing overpopulation to students of American utopian communities