those of the other two. Roma Æterna Here Nero Claudius Drusus did not die in 9 B.C. In turn, he became the successor to Augustus instead of Tiberius. The imperial line that followed was so successful that when the First Empire fell apart in the 5th century the guiding ideals of Rome were never discarded and were ultimately restored. After the Mongol invasions broke the Second Empire in the 14th century, colonies in the Hesperides preserved these ideals in turn and ultimately re-restored the empire in the late 18th century. The "current year" is 1893, and the Musket-wielding legions of the Third Empire are found from the Magna Campania to the Ganges, with no sign of retreating anytime soon. The only other significant political entities in the world are Serica (China) and its North American kingdom Fu-Sang (centered on San Francisco), Taehan (a growing empire based on the Korean Peninsula), and the isolationist South American kingdom of Huaraca. Shikaku-Mon In this "four-cornered world" Juan, Prince of Asturias, the son of King Ferdinand II and Queen Isabella of Spain survived to take the Spanish throne as King John III. The resulting changes in history spread all the way to Japan, where an increased Jesuit presence prolonged the life of Oda Nobunaga and prevented the closing of the country by the Tokugawa shogunate. In the resulting cyberpunk "current year" of 2027, the dominant powers include a Japanese Empire that covers China, India, New Zealand, and much of East Asia, the economic superpower of Brazil, the totalitarian Swedish Empire and the technologically advanced Kingdom of France. United States of Lizardia A world very similar to our own, except reptilian creatures descended from a species of Troodon are the dominant sentient lifeform. The similarities exist down to cultural and political divisions (resulting in this world's colloquial name) and are assumed by Homeline scientists to be evidence of a "law of temporal inertia" (or "gods with a strange sense of humour"). Yrth A world reminiscent of several fantasy tropes, inhabited by humans, dwarves, elves etc., all of whom have been involuntarily taken from other worldlines. The setting of GURPS Banestorm. ... And Time This chapter deals with the many theories of Temporal Physics both real and fictional that exist. Paradoxes (Assumes Fixed Time with one past, present, and future.) The Grandfather Paradox The Free Lunch Paradox (also known as the Ontological paradox The example is