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Al-Khwarizmi is arguably the most important mathematician of the Middle Ages. He developed two distinct branches of mathematics, both of which owe their name to him: algebra and algorithms. This carefully crafted biography shines a long-overdue light on these achievements, documents Khwarizmi's contributions to geography and astronomy, and paints a picture of life in the ninth-century Muslim Empire. Supports history-social science context standards mandating exploration of intellectual exchanges and contributions of Muslim scholars, and their influence on the science, geography, mathematics,...

This is a lively examination of Sojourner Truth's historic speech at the women's rights convention in 1851. Using primary source documents, it includes biographical information that shows how Truth's role as a social reformer straddled the abolitionist and women's rights movements. The book provides solid background information on the plight of women and African Americans in mid- to late nineteenth-century America, and explains some of the legends about Truth. It details and analyzes the two competing historical accounts of the speech, both of which are provided as transcripts.