The scientists and their teams who made these discoveries sense excitement, adventure, and satisfaction because they are understanding how something works for the first time, and maybe solving a serious problem too. Some scientists specialize in studying living things. We call them biologists. Some try to learn more about the ground and the earth. They're called geologists.
Physicists are scientists who study physical phenomena such as light or electricity.
At the National Institute of Environmental Health Sciences in the Research Triangle Park in North Carolina, dozens of dedicated toxicologists study the effects of different chemicals on living things. These are just a few examples of the many kinds of scientists that make discoveries every day which make life better for all of us. We become healthier, with a better understanding of our world and the other animals and plants that live here with us. Finally, a good scientist needs to communicate with other scientists through speech and in writing. That means solid skills in English are necessary.