Provides information from numerous fields of knowledge relevant to the study of environmental issues, including biology, geology, anthropology, demographics, genetics, and engineering, and explains the interrelationships of these issues.
Surveys the major facts, concepts, theories, and speculations that infuse the present understanding of time. Explores the contributions of scientists, philosophers, theologians, and creative artists from ancient times to the present.
This database provides articles containing clear, complete information on genetic disorders, including conditions, tests, procedures, treatments and therapies. Please note: Information provided in this database should not be viewed as a means for self-diagnosis or as a substitute for professional medical advice, diagnosis or treatment.
Animals are grouped by major classifications: sponges, corals, jellyfishes, segmented worms, crustaceans and mollusks, insects, fishes, amphibians, reptiles, birds, and mammals. This student edition includes an overview with photos and illustrations.
Covers more than 75 North American species from across the branches of the animal family. Provides recent information about changes in endangerment status and wildlife recovery programs, focusing on developments reported by the U.S. Fish and Wildlife Services.
Presents entries written by the world's leading mathematicians. Introduces basic mathematical tools and vocabulary, traces the development of modern mathematics, explains essential terms and concepts, examines core ideas in major areas of mathematics, describes the achievements of scores of famous mathematicians, and explores the impact of mathematics on other disciplines such as biology, finance, and music.
Teaches the essential concepts for elementary school science instruction. Topics include the basic objects in the sky, life-cycles, and properties of earth materials to the more advanced, structures of living systems, forces and motion and science technology.
Online version of the popular magazine Scientific American. Updated monthly, the magazine features articles by scientists -- many of who are Nobel Prize winners and top journalists in all fields of science and technology.