Read full issues National Geographic online going back to 1995. In addition to reading entire issues, you can also search for images and make charts showing the frequency of terms over time.
More than 82,000 definitions and encyclopedic entries on the study of the prevention, cure and understanding of disease as well as the investigation of physical and mental wellbeing.
Over 210,000 definitions and encyclopedic entries on subjects within the broad disciplines of science and technology, from engineering, physics, computer science and mathematics to life and earth sciences, chemistry and psychology.
Scholarly, government and general interest sources covering the environmental effects of individuals, corporations and governments and what can be done at each level to minimize negative impacts.
