Robert M. Yerkes was assistant professor of comparative psychology at Harvard University, managing editor of the Journal of Animal Behavior, and editor of the Animal Behavior Series.
A choreographer expresses the contemporary paradox of being a woman, Muslim, North African, Arab, and artist.
Multiple theories for the decline of Easter Island's civilization may be complementary.
Hover fly cuticles are covered in tiny spikes called nanopillars.
Conservation efforts have increased China's tree cover.