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Exhibits may be entered in one of the following categories and will be judged on the basis of two divisions: high school and elementary school. Categories, continued

Computer Science	The study and development of computer hardware, software engineering, Internet networking and communications, graphics (including human interface), simulations/ virtual reality or computational science (including data structures, encryption, coding and information theory). Topics in this category may include: writing an original program and comparing it to an existing one, developing a new language and comparing it to an existing one, or creating a program to accomplish a new task.
Earth Science	The study of the origin, structure, composition, and physical features of Earth. Topics included in this category are geology (earth composition, rock formation, fossils, minerals, and fossil fuel); geography (land forms, soils, classification of streams, erosion, and sedimentation); oceanography (ocean waves, ocean currents, composition of ocean water, and coastal zone management); seismology; geophysics; and meteorology.
Electronics	The study of engineering and technology that deals with the design and manufacture of such devices as radios, television sets, computers, transistors, or related components. Topics in this category are circuits (electrical, digital, and analog) for transmitting electricity, electric motors, solar cells, amplifiers, and computer design and construction (computer hardware).
Engineering	The study of the practical application of scientific knowledge. Sample topics include the design, construction, and operation of roads, bridges, harbors, buildings, machinery, lighting, and heating.
Environmental Science	The study of the protection and care of natural resources. Topics included in this category are solar energy and its uses, water purification and usage, pollution control, soil chemistry, and insecticides. Within this area is ecology, which is the study of ecological systems, and ecological population studies.
Health Science	The study of the human body, especially in relation to freedom from defect or disease. The study is concerned with the education and inspection of public health work. Topics in this category are mental and physical illnesses, proper diet, care of the body, and psychiatric studies.

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*Special rules may apply for projects in this category.  See the appropriate sections of this site for clarification.