Science
Biology – study of things that have DNA or interacts with things that have DNA
Botany – study of plants
Ecology – study of organisms and their interactions with the environment
Entomology – scientific study of insects
Ichthyology – study of fish
Paleontology – study of dead stuff to see how everything got here
Zoology – study of the structure, physiology, development, and classification of animals
Medicine – specific features of biology related to the health of human systems
Veterinary – specific features of biology related to the health of animal systems
Psychology – specific features of biology related to mental health
Anatomy – the study of organisms and their parts
Cardiology – the medical study of the heart
Genetics – the study of heredity and inherited traits
Immunology – the study of the immune system of the body
Medicine – the science of diagnosing and treating disease and damage to the body
Nutrition – the study of food and nourishment
Chemistry – study of molecules and atoms passing electrons and protons around
Crystallography – the science of crystal structure and phenomena
Physics – The study of energy, sometimes masquerading as mass.
Acoustics – the study of sound
Aeronautics – aircraft design, construction, and navigation
Astronomy – the study of outer space
Mechanics – design, construction, and use of machinery or mechanical structures
Optics – the study of light and vision
Earth Sciences – study of macro-scale processes that effect the formation of planets and geographic features
Geography – the study of the earth and its features
Geology – the scientific study of the origin, history, and structure of the earth
Hydrology – the study of the properties and effects of water on earth
Meteorology – the study of weather and atmospheric conditions
Mineralogy – the study of minerals, including their distribution, identification, and properties
Oceanography – the exploration and study of the ocean
Paleontology – the study of prehistoric life through fossils
Petrology – the study of the origin, composition, structure, and alteration of rocks
Seismology – the study of earthquakes
Volcanology – the study of volcanoes and volcanic phenomena
Forestry – the science and art of cultivating, maintaining, and developing forests
Technology
Engineering
Robotics – the science of technology in the design, fabrication, and application of robots
Mechanical Engineering – applies the principles of physics and material science
Electrical Engineering – generally deals with the study and application of electricity,
electronics, and electromagnetism
Mathematics
Anthropology – the study of the origin, behavior, and the physical, social, and cultural
development of humans
Archaeology – the study of past human lives by examining remaining material evidence
Cartography – the art or technique of making maps or charts
Gelotology – the study of laughter
Linguistics – the study of language and phonetics