So the number of FTEs underestimates the number of people that actually are NASA employees, though probably not by much. These numbers do not include the many people who work for other companies but who work on NASA projects. Some of those people work at NASA centers doing jobs that are indistinguishable from the jobs of civil servants in the next cubicle. Others work at aerospace companies building hardware on contract to NASA.
Medical scientists research human diseases and conditions with the goal of improving human health. Most medical scientists conduct biomedical research and development to advance knowledge of life processes and of other living organisms that affect human health, including viruses, bacteria, and other infectious agents.
Animal science is the study of animals that live alongside humans. Around the world, humans rely on animals for food, fiber, labor and companionship. Animal scientists help us understand and manage these animals. Animal scientists work with farm animals, wildlife, laboratory animals, pets and zoo animals. They study these animals to help keep them healthy and productive. Animal scientists help put food on our tables. Animal scientists work with farmers to improve animal breeding, growth and nutrition.