The Big Idea: Scientists Who Changed the World

96 pages 1998

nonfiction biography history challenging informative medium-paced

96 pages paperback 1998

nonfiction science challenging informative medium-paced

110 pages digital 1997

nonfiction biography history science challenging informative fast-paced

96 pages 1999

nonfiction informative reflective medium-paced

96 pages paperback 1998

nonfiction history science challenging informative slow-paced