1. Physics: Scientists in the field of physics study the fundamental principles that govern the behavior of matter and energy in the universe. They explore topics such as quantum mechanics, relativity, astrophysics, and particle physics. 2. Biology: Biologists study living organisms, including their structure, function, growth, evolution, and interactions with their environment. This field encompasses a wide range of sub-disciplines, such as genetics, ecology, and microbiology. 3. Chemistry: Chemists investigate the properties, composition, and behavior of matter at the atomic and molecular level. They explore topics such as chemical reactions, bonding, and the synthesis of new compounds. 4. Computer Science: Computer scientists study the theory, design, implementation, and application of computer systems and software. This field includes areas such as artificial intelligence, computer networking, and programming languages. 5. Psychology: Psychologists study the mind and behavior, exploring topics such as cognition, emotions, social interactions, and mental health. This field encompasses sub-disciplines such as clinical psychology, cognitive psychology, and developmental psychology. 6. Environmental Science: Environmental scientists study the interactions between the environment and living organisms, as well as the impact of human activities on ecosystems and natural resources. This field includes areas such as environmental chemistry, conservation biology, and climate science.