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: Evolution and Equilibrium, Unifying Concepts and Processes: Form and Function, and Life Science as outlined by the National Academics of Science and endorsed by the National Science Teachers Association.