These four Factfinders titles introduce an exciting new reference series that are sure to entice young readers by putting the wonders of the world at your fingertips. With over 30,000 terms and more than 4,000 detailed, eye-catching illustrations, these comfortable and comprehensive reference volumes provide definitions, diagrams, maps, and handy fast facts throughout. From the habits and habitats of the earth's animals to the mysterious reaches of outer space, from the marvels of human anatomy to the drama of the past, Factfinders are your guides to knowledge and discovery.