Several stories within the "One Thousand and One Nights" feature early science fiction elements. One example is "The Adventures of Bulukiya", where the protagonist Bulukiya's quest for the herb of immortality leads him to explore the seas, journey to Paradise and to Hell, and travel across the cosmos to different worlds much larger than his own world, anticipating elements of galactic science fiction; along the way, he encounters societies of jinn, mermaids, talking serpents, talking trees, and other forms of life. In "Abu al-Husn and His Slave-Girl Tawaddud", the heroine Tawaddud gives an impromptu lecture on the mansions of the Moon, and the benevolent and sinister aspects of the planets.