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A
Acid-Base Chemistry3Acoustics25Adhesion Science1Aerodynamics8Aging Biology6AI & Cloud Computing10Algebra8Algorithms8Allergies & Immunology1American Civil War History3American Colonial History4American Founding Documents6American Reconstruction Era History1American Slavery History3American Westward Expansion3Ancient Afterlife Beliefs1Ancient Civilizations39Ancient Egyptian Rulers1Ancient Sites & Archaeology21Ancient Trade Routes2Animal Adaptations46Animal Anatomy12Animal Behavior41Animal Celestial Navigation1Animal Coats & Fur1Animal Cognition4Animal Coloration1Animal Communication1Animal Development3Animal Domestication1Animal Eye Color1Animal Habitats2Animal Longevity1Animal Material Composition1Animal Parental Care1Animal Physiology33Animal Reproduction1Animal Social Behavior1Animal Thermoregulation3Animal Training1Animal Vision1Animal Vocalizations1Animals41Animation1Architecture15Arithmetic Operations7Art History2Artificial Intelligence6Arts & Crafts3Astrobiology3Astronomy52Atmospheric Chemistry2Atmospheric Dynamics17Atmospheric Electricity4Atmospheric Layers2Atmospheric Optics13Atmospheric Pressure4Atomic and Subatomic Structure12Auditory Cognition14B
Baking3Balance & Equilibrium5Banking & Finance15Biochemistry3Biodiversity4Biological Classification3Bioluminescence3Biomechanics10Biomes1Biometric Identification1Biotechnology1Black Holes1Bodies16Bridges1Buildings5Buoyancy & Flotation7Business Finance2Business Fundamentals1C
Calculus2Calculus: Limits1Carnivorous Plants2Castles4Catalysis1Cave Art1Cave Formations2Cell Biology6Cell Division1Chemical and Physical Changes4Chemical Bonding4Chemical Elements6Chemical Reactions11Chemistry57Circadian Rhythms3Civics26Civil Engineering8Civil Rights Movement History3Cleaning Science6Climate12Cognition12Cognitive Strategies2Cold War2Collisions & Impact1Colonialism1Color Theory4Color Vision6Community4Composition of Matter4Computer Memory4Computer Networks8Computer Science Fundamentals14Computer Vision4Conservation of Energy1Conservation of Mass1Construction Processes3Control Systems5Coordinate Systems2Coral Reefs2Corrosion1Cosmology4Counting & Quantity1Creative Process6Cryobiology1Cryptography4Crystallography3Cultural Heritage Preservation1Cultural History20Cultural Landmarks8Cultural Symbols3Cultural Traditions9D
Data & Information4Data Encoding2Data Visualization1Decimals2Decomposition & Nutrient Cycling1Defensive Architecture1Digestion8Digital Computing7Digital Currency1Digital Imaging2Digital Security7Digital Video Technology2Dinosaurs & Prehistoric Life5Display Technology1Dog Breeds20Doppler Effect1E
Earth9Earth's Orbit & Tilt3Earth's Shape1Earthquakes3Echolocation1Ecological Succession & Recovery2Economic History10Economics35Ecosystems20Electrical Circuits11Electrical Outages1Electrical Safety1Electricity6Electrochemistry3Electromagnetism3Electronics26Elevator Technology1Emergency Services1Emotions15Empire Dynamics3Energy28Energy Storage1Engine Principles4Entrepreneurship2Environmental Science10Erosion2Evolution7Exercise Physiology6Exploration & Discovery3Exponents & Logarithms1Extinction Events2Extremophile Biology2F
Filmmaking & Production2Financial Charting1Fire Science4Fluid Balance3Fluid Dynamics1Food38Food & Culture6Food Chemistry30Food Microbiology6Food Preservation3Food Production11Forces and Motion23Fractals1Fractions4Friction4Fungi Biology4G
Galaxies2Game Mechanics2Games & Sports16Gene Editing1Generative AI2Genetics16Geography26Geology45Geometry23Glaciers & Icebergs1Glaciology2Global History3Global Positioning Systems1Gravity7H
Historical Cities6Historical Memory & Remembrance2Historical Sites11History34History of Computing3History of Knowledge & Education3History of Mathematics9History of Measurement Systems1History of Medicine2History of Philosophy1History of Religions2History of Science7History of Technology22History of Urban Systems6Holidays & Cultural Traditions7Household Appliances9Human Anatomy14Human Development5Human Eye Color1Human Hair Color1Human Microbiome3Human Migration History3Human Physiology89Human Spaceflight3Human Survival Strategies1Human Thermoregulation2Human Vision8HVAC Systems1Hydration2Hydroelectric Power1Hydrology3I
Indigenous American History4Indirect Measurement1Industrial Revolution History4Infant Language Acquisition2Infection & Transmission7Information Retrieval Systems5Infrastructure Development1Infrastructure Economics1Insurance & Risk Management1Intellectual History2Intercultural Communication2International Finance2International Relations2International Trade9Inventions37Investing5L
Labor Economics8Landforms25Language Variation3Languages6Legislative Process1Life Cycles12Life Transitions1Light & Color39Lighting Technology4Linear Algebra1Linguistics18Literary Awards & Recognition1Living Things3Luminescence & Phosphorescence1M
Machine Learning4Machines18Magnetism3Manufacturing Processes10Manuscript Production2Maps3Marine Biology10Marine Ecosystems4Marine Engineering2Maritime Disasters1Market Dynamics2Materials Science25Math21Mathematical Constants2Mathematical Foundations11Measurement Systems10Meat Science1Mechanical Connections1Mechanisms18Medieval History3Memory10Metabolism1Microorganisms12Military History3Minerals2Molecular Biology4Money16Money Supply & Inflation2Motion Sickness1Music23Music Cognition4Music Recording Technology1Music Theory3Musical Collaboration1Musical Instruments3N
Naming & Identity2Narrative Techniques1National Parks & Conservation1Natural Patterns5Navigation10Neuroscience52New Deal History1Nonverbal Communication3Nonviolent Resistance2Number Factors1Number Magnitude5Number Properties5Number Puzzles & Games1Number Systems13Nutrition6O
Ocean Currents1Oceanography11Olfaction & Smell9Optical Illusions2Optical Instruments2Optics26Oral Health & Hygiene1Orbital Mechanics9Order of Operations1Organic Chemistry1Origami & Paper Arts1Origins of Agriculture3Oscillations & Resonance2P
Pain & Nociception6Paint Chemistry & Technology1Paleontology4Patterns2Payment Systems3People & Society10Percentages1Personal Finance9Photography2Photosynthesis3Physical Activity4Physics76Phytochemistry1Place Value2Planetary Atmospheres3Planetary Dynamics3Planetary Science24Plant Adaptations4Plant Physiology22Plants22Plate Tectonics6Plumbing Systems4Poetic Devices1Poetry2Polar Ecosystems1Political Geography3Political History12Political History & Human Rights13Political Revolutions5Political Systems13Polymer Chemistry1Power (Physics)1Power Systems5Prehistory & Human Origins9Printing & Binding4Probability & Statistics15Programming1R
Radioactivity & Nuclear Science2Ratios & Proportions1Reading Acquisition1Refraction1Refrigeration Systems3Regeneration Biology2Relativity1Renaissance History1Respiration4Retail & Sales3Retirement Planning1Robotics6Rocket Propulsion1Rocks & The Rock Cycle4Rotational Mechanics3Rounding & Estimation1S
Satellite Applications4Scientific Recognition & Awards8Seasons5Semiconductors8Sensor Technology13Sensory Perception8Set Theory & Infinity2Severe Weather5Shadows1Sign Languages2Simple Machines2Skin Biology3Sleep20Social Cognition6Social Customs4Social History20Social Psychology7Social Welfare Systems1Software Applications3Software Bugs1Soil Science5Solutions and Solubility4Sound & Meaning in Language1Space11Space Colonization1Space Physiology1Space Race History1Space Weather3Spatial Cognition1Special Effects1Speech & Language Processing2Sports Equipment Design2Sports History2Sports Rules & Officiating1States of Matter13Static Electricity2Stellar Physics2Stories & Books6Storytelling Elements2Structural Engineering6Submarine Cables1Supply Chains4Symbiotic Relationships7Symmetry2T
Taste & Gustation10Taxation3Technological Impact7Technology10Technology Industry2Telecommunication Systems6Temperature Sensing2Tessellations1Textile Production History1Thermal Physics24Thermoregulation2Tide Pools1Time Perception1Timekeeping13Topology1Traffic Control Systems1Transatlantic Slave Trade1Transportation History4Trigonometry2Tsunamis1U
U.S. Founding History4Underwater Construction1Urban Planning2Urban Studies3US Territorial Expansion1