- Edison is a key historical figure. — Special sales opportunities to American history museums and historical sites. — Includes index and «Words You Know» section that highlights terms and concepts from the text and illustrates them with photographs. Grades K-4 National Social Studies Standards — Time, Continuity, and Change: II — Accounts of past events, people, places, and situations contribute to our understanding of the past — People, Places, and Environments: III — Describe how people in different areas reflect ideas, personality, culture, and wants and needs in their homes, schools, etc. — Science, Technology, and Society: VIII — Identify and describe ways in which science and technology have changed society.