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In the first volume of his Parerga and Paralipomena, Schopenhauer wrote his "Sketch of a History of the Doctrine of the Ideal and the Real". He defined the ideal as being mental pictures that constitute subjective knowledge. The ideal, for him, is what can be attributed to our own minds. The images in our head are what comprise the ideal. Schopenhauer emphasized that we are restricted to our own consciousness. The world that appears is only a representation or mental picture of objects. We directly and immediately know only representations. All objects that are external to the mind are known indirectly through the mediation of our mind. He offered a history of the concept of the "ideal" as "ideational" or "existing in the mind as an image".

What type of knowledge did Schopenhauer believe the ideal to be?
Answer: subjective
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The Enlightenment known in French as the Siecle des Lumieres, the Century of Enlightenment, and in German as the Aufklarung was a philosophical movement which dominated the world of ideas in Europe in the 18th century. The Enlightenment included a range of ideas centered on reason as the primary source of authority and legitimacy, and came to advance ideals such as liberty, progress, tolerance, fraternity, constitutional government and ending the abuses of the church and state. In France, the central doctrines of the Lumieres were individual liberty and religious tolerance, in opposition to the principle of absolute monarchy and the fixed dogmas of the Roman Catholic Church. The Enlightenment was marked by increasing empiricism, scientific rigor, and reductionism, along with increased questioning of religious orthodoxy.

Which movement dominated the world of ideas in Europe in the 18th century?
Answer: The Enlightenment
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Depleted uranium is also used as a shielding material in some containers used to store and transport radioactive materials. While the metal itself is radioactive, its high density makes it more effective than lead in halting radiation from strong sources such as radium. Other uses of depleted uranium include counterweights for aircraft control surfaces, as ballast for missile re-entry vehicles and as a shielding material. Due to its high density, this material is found in inertial guidance systems and in gyroscopic compasses. Depleted uranium is preferred over similarly dense metals due to its ability to be easily machined and cast as well as its relatively low cost. The main risk of exposure to depleted uranium is chemical poisoning by uranium oxide rather than radioactivity (uranium being only a weak alpha emitter).

What trait causes depleted uranium to be used in gyroscopic compasses?
Answer:
high density