There are 14 different categories in both Junior and Senior Divisions.
BEHAVIORAL SCIENCE (BEH)
Human and animal behavior, social and community relationships- psychology, sociology, anthropology, archaeology, ethology, ethnology, linguistics, learning, perception, urban problems, reading problems, public opinion surveys, educational testing, etc.
Chemistry of life processes- molecular biology, molecular genetics, enzymes, photosynthesis, blood chemistry, protein chemistry, food chemistry, hormones, etc.
Study of plant life- agriculture, agronomy, horticulture, forestry, plant taxonomy, plant physiology, plant pathology, plant genetics, hydroponics, algae, etc.
Study of nature and composition of matter and laws governing it- physical chemistry, organic chemistry (other than biochemistry), inorganic chemistry, materials, plastics, fuels, pesticides, metallurgy, soil chemistry, etc.
COMPUTER SCIENCE (COMP)
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).
EARTH & SPACE SCIENCE (EARTH)
Geology, mineralogy, physiography, oceanography, meteorology, climatology, astronomy, speleology, seismology, geography, etc.
Technology; projects that directly apply scientific principles to manufacturing and practical uses- civil, mechanical, aeronautical, chemical, electrical, electronic, photographic, sound, automotive, marine, heating and refrigerating, transportation, environmental engineering, etc.
ENVIRONMENTAL SCIENCE (ENV)
Study of pollution (air, water, and land) sources and their control; ecology.
HEALTH SCIENCE (HEALTH)
Study of diseases and health of humans and animals- dentistry, pharmacology, pathology, ophthalmology, nutrition, sanitation, dermatology, allergies, speech and hearing, etc.
MATERIALS SCIENCE (MAT)
is the study of materials and how they can be adapted and fabricated to meet the needs of modern technology.
Development of formal logical systems or various numerical and algebraic computations, and the application of these principles – calculus, geometry, abstract algebra, number theory, statistics, complex analysis, probability.
Biology of microorganisms- bacteriology, virology, protozoology, fungi, bacterial genetics, yeast, etc.
Theories, principles, and laws governing energy and the effect of energy on matter- solid state, optics, acoustics, particle, nuclear, atomic, plasma, superconductivity, fluid and gas dynamics, thermodynamics, semiconductors, magnetism, quantum mechanics, biophysics, etc.
Study of animals -animal genetics, ornithology, ichthyology, herpetology, entomology, animal ecology, paleontology, cellular physiology, circadian rhythms, animal husbandry, cytology, histology, animal physiology, invertebrate neurophysiology, studies of invertebrates, etc