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We find billboards becuase people advertise for things. The government and other place billboards to advertise bussinesses and services.
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Great centers of religious learning were also centers of knowledge and scientific development.
from the second half of the eighth century to the end of the eleventh century, Islamic scientific developments were the basis of knowledge in the world. At a period of history when the scientific and philosophical heritage of the ancient world was about to be lost, Islamic scholars stepped in to preserve that heritage from destruction. Indeed, without the cultivation of science in these early centuries by Islamic scholars, it is probable that texts which later exercised a formative influence over Western culture would never have survived intact. It is certain, moreover, that the modern world would look much different than it does today.
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A restriction on when a union may call a strike.
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