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In the 20th century, new types of glass such as laminated glass, reinforced glass and glass bricks have increased the use of glass as a building material and resulted in new applications of glass. Multi-storey buildings are frequently constructed with curtain walls made almost entirely of glass. Similarly, laminated glass has been widely applied to vehicles for windscreens. While glass containers have always been used for storage and are valued for their hygienic properties, glass has been utilized increasingly in industry. Optical glass for spectacles has been used since the late Middle Ages. The production of lenses has become increasingly proficient, aiding astronomers as well as having other application in medicine and science. Glass is also employed as the aperture cover in many solar energy systems.

What type of power systems use glass?
Answer: solar
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The last king of the Roman Kingdom, Lucius Tarquinius Superbus, was overthrown in 509 BC by a group of noblemen led by Lucius Junius Brutus. Tarquin made a number of attempts to retake the throne, including the Tarquinian conspiracy, the war with Veii and Tarquinii and finally the war between Rome and Clusium, all of which failed to achieve Tarquin's objectives. The most important constitutional change during the transition from kingdom to republic concerned the chief magistrate. Before the revolution, a king would be elected by the senators for a life term. Now, two consuls were elected by the citizens for an annual term. Each consul would check his colleague, and their limited term in office would open them up to prosecution if they abused the powers of their office. Consular political powers, when exercised conjointly with a consular colleague, were no different from those of the old king.

Who would elect a king in the Roman Kingdom prior to the revolution?
Answer: senators
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Some succeeded their fathers as rulers, such as Sultan Ahmad al-Mansur, who ruled Morocco from 1578 to 1608. He was not technically considered as a mixed-race child of a slave; his mother was Fulani and a concubine of his father. Such tolerance for black persons, even when technically "free", was not so common in Morocco. The long association of sub-Saharan peoples as slaves is shown in the term abd (Arabic: ,) (meaning "slave"); it is still frequently used in the Arabic-speaking world as a term for black people.

When did Sultan Ahmad al-Mansur rule?
Answer:
from 1578 to 1608