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DEFINITION: (noun) A throne that is the official chair of a bishop. SYNONYMS: bishop's throne. USAGE: Shortly after ascending to the cathedra, the bishop began working to end corruption.

Cruz was a Brazilian physician, scientist, and the founder of the Oswaldo Cruz Institute, a scientific institution for research and development in biomedical sciences. As the Director General of Public Health, Cruz took strong measures to combat the bubonic plague, smallpox, and yellow fever. What happened when he tried to reinstate a law imposing mandatory smallpox vaccination?

The Statue of Liberty, located on Liberty Island in New York Harbor, was a gift to the US from France to commemorate the centennial of the Declaration of Independence. The statue was designed by the French sculptor F.A. Bartholdi in the form of a woman with an uplifted arm holding a torch. The pedestal was designed by American architect Richard Morris Hunt, and its cornerstone was laid on August 5, 1885. Who served as Bartholdi's model for the Statue of Liberty?

Researchers at the University of London say bumblebees prefer to feed on plants with warmer nectar. Bees apparently judge a flower's temperature on the basis of its color, and plants may even adapt their colors to attract bees for pollination. The researchers say their findings help explain the connection between sensory cues and pollinator behavior.

Mosaic is the art of arranging small colored tiles in order to create a surface ornament. The ancient Greeks were the first to use large-scale mosaic, and it was also used by the Romans for their baths and villas. Mosaic reached the height of its development in the early Byzantine period, when gold leaf was used extensively. Spectacular modern examples of mosaics can be found in Gaudi's Park Güell in Barcelona. What mathematical problems are associated with tile arrangement?