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Cairo ( KY-roh; Arabic: القاهرة, romanized: al-Qāhirah, pronounced [ælˈqɑːhɪɾɑ] (listen),...
For the petroleum company, see: Petrolina (company). Petrolina is a city located in the...
Cobalt is a chemical element with the symbol Co and atomic number 27. Like nickel, cobalt is...