The document summarizes the spread of Hellenistic culture following the conquests of Alexander the Great. It established Alexandria, Egypt as a major center of learning and scholarship, including the Great Library of Alexandria containing 500,000 scrolls. Major scientific advances were made in astronomy, geometry, and philosophy during this period by thinkers such as Ptolemy, Euclid, Archimedes, and Epicurus. Hellenistic art also flourished, seen in realistic sculptures that honored gods and ordinary people alike, exemplified by works such as the Colossus of Rhodes and Nike of Samothrace. Four major kingdoms emerged after Alexander's death that eventually were all conquered by the Romans.