Uncover the intriguing, and often mysterious, world of science in Lerner's Discovery! series. From late-breaking hot topics to conundrums whose answers have been concealed for centuries, books in this series provide in-depth coverage of science topics that young readers everywhere will find fascinating! Supports the national science education standards Unifying Concepts and Processes: Systems, Order, and Organization; Unifying Concepts and Processes: Constancy, Change, and Measurement; Unifying Concepts and Processes: Evolution and Equilibrium; Life Science; and Science in Personal and Social Perspectives as outlined by the National Academics of Science and endorsed by the National Science Teachers Association.