Input: Read this: The Marxist critique of capitalism — developed with Friedrich Engels — was, alongside liberalism and fascism, one of the defining ideological movements of the Twentieth Century. The industrial revolution produced a parallel revolution in political thought. Urbanization and capitalism greatly reshaped society. During this same period, the socialist movement began to form. In the mid-19th century, Marxism was developed, and socialism in general gained increasing popular support, mostly from the urban working class. Without breaking entirely from the past, Marx established principles that would be used by future revolutionaries of the 20th century namely Vladimir Lenin, Mao Zedong, Ho Chi Minh, and Fidel Castro. Though Hegel's philosophy of history is similar to Immanuel Kant's, and Karl Marx's theory of revolution towards the common good is partly based on Kant's view of history—Marx declared that he was turning Hegel's dialectic, which was "standing on its head", "the right side up again". Unlike Marx who believed in historical materialism, Hegel believed in the Phenomenology of Spirit. By the late 19th century, socialism and trade unions were established members of the political landscape. In addition, the various branches of anarchism, with thinkers such as Mikhail Bakunin, Pierre-Joseph Proudhon or Peter Kropotkin, and syndicalism also gained some prominence. In the Anglo-American world, anti-imperialism and pluralism began gaining currency at the turn of the 20th century.
Question: Whose theory of revolution is similar to Immanuel Kant's philosophy of history?

Output: unanswerable


Input: Read this: According to eastern homeland theory, prior to becoming known to the Roman world, Slavic-speaking tribes were part of the many multi-ethnic confederacies of Eurasia – such as the Sarmatian, Hun and Gothic empires. The Slavs emerged from obscurity when the westward movement of Germans in the 5th and 6th centuries CE (thought to be in conjunction with the movement of peoples from Siberia and Eastern Europe: Huns, and later Avars and Bulgars) started the great migration of the Slavs, who settled the lands abandoned by Germanic tribes fleeing the Huns and their allies: westward into the country between the Oder and the Elbe-Saale line; southward into Bohemia, Moravia, much of present-day Austria, the Pannonian plain and the Balkans; and northward along the upper Dnieper river. Perhaps some Slavs migrated with the movement of the Vandals to Iberia and north Africa.
Question: What empires were part of the Roman world?

Output: unanswerable


Input: Read this: For example, consider electron–positron annihilation, in which the rest mass of individual particles is destroyed, but the inertia equivalent of the system of the two particles (its invariant mass) remains (since all energy is associated with mass), and this inertia and invariant mass is carried off by photons which individually are massless, but as a system retain their mass. This is a reversible process – the inverse process is called pair creation – in which the rest mass of particles is created from energy of two (or more) annihilating photons. In this system the matter (electrons and positrons) is destroyed and changed to non-matter energy (the photons). However, the total system mass and energy do not change during this interaction.
Question: What is it called when the rest mass of individual particles is destroyed but the inertia equivalent of the system of the three particles remains?

Output: unanswerable


Input: Read this: Externally, Orthodox Jews can be identified by their manner of dress and family lifestyle. Orthodox women dress modestly by keeping most of their skin covered. Additionally, married women cover their hair, most commonly in the form of a scarf, also in the form of hats, bandanas, berets, snoods or, sometimes, wigs. Orthodox men wear a skullcap known as a kipa and often fringes called "tzitzit". Haredi men often grow beards and always wear black hats and suits, indoors and outdoors. However, Modern Orthodox Jews are commonly indistinguishable in their dress from those around them.
Question: what part of their body do married women cover with a scarf?

Output:
hair