<P>A concise guide to all things historical, this feast of facts and compelling stories recounts the revolutionary ideas, acts, and inventions that have changed the world. Beginning with a section on historical eras, this popular reference source tracks history and organizes information in 13 specific subject sections, ranging from politics and war to science and religion. It tackles exploration and settlement, technological advances, legal fireworks, financial and business events, social movements, natural and man-made disasters, medicine and disease, and art and culture. From the Stone Age to sports, from the Trojan War to the Arab Spring, and from the Hippocratic Oath to the internet, this is the perfect companion for history buffs of any age.