1. Environmental Scientist: Environmental scientists study the natural environment and how human activities impact it. They may work to develop solutions for environmental issues such as pollution, climate change, and habitat destruction. 2. Biochemist: Biochemists study the chemical processes and substances that occur within living organisms. They work to understand how these processes work and how they can be manipulated to develop new drugs or treatments for diseases. 3. Astrophysicist: Astrophysicists study the physical properties of celestial bodies such as stars, planets, and galaxies. They may work to understand the origins of the universe, the behavior of black holes, or the potential for life on other planets. 4. Neuroscientist: Neuroscientists study the structure and function of the brain and nervous system. They may research how the brain processes information, controls behavior, or responds to injury or disease. 5. Epidemiologist: Epidemiologists study the patterns and causes of disease within populations. They may work to track and control the spread of infectious diseases, investigate the causes of chronic diseases, or evaluate the effectiveness of public health interventions. 6. Criminologist: Criminologists study the causes and consequences of crime, as well as societal responses to criminal behavior. They may work to develop policies and programs to prevent crime, rehabilitate offenders, or improve the criminal justice system. 7. Marine Biologist: Marine biologists study the biology and ecology of marine organisms and ecosystems. They may research topics such as marine conservation, fisheries management, or the impacts of climate change on ocean ecosystems. 8. Materials Scientist: Materials scientists study the properties and behaviors of different materials, such as metals, polymers, and ceramics. They may work to develop new materials for specific applications, such as stronger and lighter materials for aerospace or electronic devices. 9. Behavioral Economist: Behavioral economists study how psychological factors influence economic decision-making. They may research topics such as consumer behavior, savings and investment choices, or policy-making.