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DEFINITION: (noun) A tower with a light that gives warning of shoals to passing ships. SYNONYMS: lighthouse, beacon. USAGE: The pharos was no longer operational and served as a tourist attraction in the sleepy beach town.

Nietzsche was a German philosopher whose critiques of contemporary culture, religion, and philosophy centered on a basic question regarding the foundation of values and morality. He passionately rejected Western bourgeois civilization and regarded Christian civilization as decadent; in place of its "slave morality," he looked to the superman, the creator of a new heroic morality that would consciously affirm life and the life values. What is Nietzsche's concept of perspectivism?

True color images taken and transmitted by Galileo, the unmanned spacecraft launched in 1989, allowed scientists to find out more about lo, the innermost of Jupiter's four Galilean moons. The images revealed erupting volcanoes and extraordinary variations in color and brightness. Other data indicated that lo has an iron core and might have its own gravitational field. What is the origin of Io's name?

Aphasia is a language disturbance caused by a lesion of the brain, making an individual partially or totally impaired in his ability to speak, write, or comprehend the meaning of spoken or written words. It is distinguished from functional disorders such as stammering or stuttering, and from impaired speech due to physical defects in the organs used for speaking. What is the difference between Broca's aphasia and Wernicke's aphasia?

According to new data from the Hubble Space Telescope, the small spot on Jupiter, which was pale white a year ago, now matches the reddish hue of the Great Red Spot and boasts 400 mph winds. Both spots are actually fierce storms in Jupiter's atmosphere. Scientists speculate that the smaller spot, nicknamed Red Spot Jr., but officially called "Oval BA," picked up red material, most likely some form of sulfur, from lower in the Jupiter atmosphere.