Gemma 4-written cc0 Small Core Science Encyclopedia

Free to use or distribute.

• 3C 273
• Abacus
• Abdomen
• Abiogenesis
• Abrasive
• Absolute zero
• Absorption spectroscopy
• Abyssal plain
• Acceleration
• Accuracy and precision
• Acetic acid
• Acetone
• Acid
• Acid rain
• Acid–base reaction
• Acne
• Acoustics
• Acre
• Actinide
• Actinium
• Active galactic nucleus
• Active transport
• Acupuncture
• Adaptation
• Addiction
• Adenosine triphosphate
• Adhesive
• Adrenal gland
• Adrenaline
• Aeolian processes
• Aerodynamics
• Aerosol
• Aerospace engineering
• Ageing
• Agricultural science
• Agronomy
• Air conditioning
• Air mass
• Air traffic control
• Aircraft
• Aircraft carrier
• Aircraft engine
• Airplane
• Airport
• Airship
• Akashi Kaikyo Bridge
• Albedo
• Alchemy
• Alcohol (chemistry)
• Alcohol (drug)
• Alcohol intoxication
• Alcoholism
• Aldehyde
• Alkali metal
• Alkaline earth metal
• Alkaloid
• Alkane
• Alkene
• Alkyne
• Allergy
• Allotropy
• Alloy
• Alluvial fan
• Alpha particle
• Alternating current
• Alternation of generations
• Alternative medicine
• Alum
• Aluminium
• Alzheimer's disease
• Amalgam (chemistry)
• Amateur radio
• Amber
• Ambulance
• Americium
• Amide
• Amine
• Amino acid
• Ammonia
• Ammonium nitrate
• Ammonium sulfate
• Amorphous solid
• Amount of substance
• Ampere
• Amplifier
• Amplitude
• Amputation
• Analgesic
• Analytical chemistry
• Anatomy
• Android (operating system)
• Andromeda Galaxy
• Anemia
• Anesthesia
• Aneurysm
• Angiology
• Angular momentum
• Animal coloration
• Animal husbandry
• Animal locomotion
• Animal migration
• Antenna (radio)
• Anthrax
• Anti-reflective coating
• Antibiotic
• Antibody
• Antimatter
• Antimony
• Antiparticle
• Anxiety disorder
• Aquaculture
• Aqueduct (water supply)
• Arch
• Archipelago
• Architectural engineering
• Argon
• Arm
• Armour
• Aromatic compound
• Arsenic
• Artery
• Arthritis
• Artificial intelligence
• Artificial island
• Artificial organ
• Asexual reproduction
• Aspirin
• Assembly language
• Assembly line
• Astatine
• Asteroid
• Asteroid belt
• Asthma
• Astrometry
• Astronaut
• Astronomical coordinate systems
• Astronomical object
• Astronomical unit
• Astronomy
• Astrophysics
• Atacama Large Millimeter Array
• Atmosphere
• Atmosphere of Earth
• Atmospheric circulation
• Atmospheric pressure
• Atmospheric science
• Atoll
• Atom
• Atomic clock
• Atomic mass
• Atomic nucleus
• Atomic number
• Atomic orbital
• Atomic physics
• Attention deficit hyperactivity disorder
• Auditory system
• Aurora
• Authentication
• Autism
• Autoimmune disease
• Automation
• Autopsy
• Autumn
• Avalanche
• Aviation
• Axe
• Axle
• Ballista
• Ballistics
• Balloon (aeronautics)
• Bandage
• Barcode
• Barge
• Barium
• Bark (botany)
• Barometer
• Barred spiral galaxy
• Barycenter (astronomy)
• Baryon
• Basalt
• Base (chemistry)
• Basket weaving
• Bathing
• Bauxite
• Bay
• Beach
• Bearing (mechanical)
• Becquerel
• Beekeeping
• Benzene
• Benzodiazepine
• Berkelium
• Bernoulli's principle
• Berry (botany)
• Beryllium
• Beta particle
• Bicycle
• Big Bang
• Binary star
• Binding energy
• Binoculars
• Binomial nomenclature
• Biochemistry
• Biodiversity
• Biological pigment
• Biological warfare
• Biology
• Biome
• Biomechanics
• Biomedical engineering
• Biomolecule
• Biopsy
• Biosphere
• Biotechnology
• Bipedalism
• Bipolar disorder
• Bismuth
• Bit
• Black hole
• Black-body radiation
• Blazar
• Bleach
• Bleeding
• Blizzard
• Blood
• Blood pressure
• Blood sugar level
• Blood test
• Blood transfusion
• Blood type
• Blue
• Blunt trauma
• Boat
• Body mass index
• Body of water
• Bog
• Bohr model
• Boiling
• Bone
• Bone fracture
• Book
• Boomerang
• Boric acid
• Boron
• Bose–Einstein condensate
• Boson
• Botany
• Botulism
• Bow and arrow
• Brain
• Brain injury
• Brain tumor
• Brainstem
• Brass
• Breast cancer
• Breathing
• Breccia
• Bremsstrahlung
• Brick
• Bridge
• Broadcasting
• Bromine
• Bronchitis
• Bronze
• Brooklyn Bridge
• Brown dwarf
• Bruise
• Brush
• Bubonic plague
• Building
• Bulletproof vest
• Buoyancy
• Burn
• Bus
• Butane
• Byte
• C (programming language)
• Cable television
• Cable transport
• Cadmium
• Caesium
• Caffeine
• Calcium
• Calcium carbonate
• Calcium chloride
• Calculator
• Calendar
• Californium
• Calipers
• Callisto (moon)
• Calorie
• Cambrian
• Cambrian explosion
• Camera
• Camouflage
• Canal
• Cancer
• Candela
• Candle
• Canoe
• Canopus
• Canvas
• Canyon
• Capacitance
• Capacitor
• Capella
• Capillary
• Car
• Carbohydrate
• Carbon
• Carbon dioxide
• Carbon monoxide
• Carbon nanotube
• Carbonate
• Carboxylic acid
• Carcinogen
• Cardiac arrest
• Cardiology
• Cardiopulmonary bypass
• Cardiovascular disease
• Cargo
• Carina Nebula
• Carnivore
• Carotenoid
• Carpentry
• Carriage
• Cart
• Cartilage
• Cassiopeia (constellation)
• Cast iron
• Castle
• Catalysis
• Catapult
• Cathode ray tube
• Cave
• Cavity magnetron
• Ceiling
• Celestial mechanics
• Celestial navigation
• Celestial sphere
• Cell (biology)
• Cell biology
• Cell cycle
• Cell membrane
• Cell nucleus
• Cell signaling
• Cell wall
• Cellular respiration
• Cellulose
• Celsius
• Cement
• Cenozoic
• Centaurus
• Centaurus A
• Central heating
• Central nervous system
• Central processing unit
• Centrifuge
• Centriole
• Centripetal force
• Cepheid variable
• Ceramic
• Cerebellum
• Cerebral cortex
• Cerebral palsy
• Cerebrum
• Ceres (dwarf planet)
• Cerium
• Chain
• Chain mail
• Chainsaw
• Character encoding
• Charcoal
• Charge-coupled device
• Chariot
• Chemical biology
• Chemical bond
• Chemical compound
• Chemical element
• Chemical engineering
• Chemical equation
• Chemical equilibrium
• Chemical formula
• Chemical kinetics
• Chemical plant
• Chemical reaction
• Chemical synthesis
• Chemistry
• Chemotherapy
• Chickenpox
• Chimney
• Chisel
• Chitin
• Chloride
• Chlorine
• Chlorophyll
• Chloroplast
• Cholera
• Cholesterol
• Chromatography
• Chromium
• Chromosome
• Chronic obstructive pulmonary disease
• Chronology of the universe
• Cigarette
• Circadian rhythm
• Circuit breaker
• Circuit design
• Circulatory system
• Cirrhosis
• Cirrus cloud
• Citric acid
• Civil engineering
• Clamp (tool)
• Classical mechanics
• Clay
• Climate variability and change
• Climatology
• Clock
• Clothes dryer
• Cloud
• Cloud chamber
• Club (weapon)
• Clutch
• CMYK color model
• Coal
• Coast
• Cobalt
• Colloid
• Color
• Color blindness
• Color theory
• Color vision
• Colorectal cancer
• Coma
• Combine harvester
• Combustion
• Comet
• Common cold
• Communications satellite
• Compass
• Competition (biology)
• Compiler
• Composite material
• Compound eye
• Computer
• Computer architecture
• Computer file
• Computer hardware
• Computer keyboard
• Computer monitor
• Computer mouse
• Computer network
• Computer program
• Computer programming
• Computer science
• Computer security
• Computer simulation
• Computing
• Concrete
• Concussion
• Condensation
• Condensed matter physics
• Conglomerate (geology)
• Connective tissue
• Conservation of energy
• Conservation of mass
• Constellation
• Consumer electronics
• Container
• Continental shelf
• Continuum mechanics
• Controlled-access highway
• Convection
• Cooling tower
• Coordinated Universal Time
• Copper
• Coral reef
• Coriolis force
• Corrosion
• Cosmic distance ladder
• Cosmic inflation
• Cosmic microwave background
• Cosmic ray
• Cosmological constant
• Coulomb
• Coulomb's law
• Covalent bond
• Crab Nebula
• Crane (machine)
• Cretaceous
• Cretaceous–Paleogene extinction event
• Critical point (thermodynamics)
• Crop
• Crossbow
• Crust (geology)
• Cryosphere
• Cryptography
• Crystal
• Crystallization
• Crystallography
• Cubit
• Cultivar
• Cultivator
• Cumulonimbus cloud
• Cumulus cloud
• Curium
• Cuticle
• Cyanide
• Cybernetics
• Cycling
• Cyclone
• Cygnus X-1
• Cytoplasm
• Cytoskeleton
• Dagger
• Dairy
• Dalton (unit)
• Dam
• Dark energy
• Dark matter
• Dark nebula
• Data
• Data communication
• Data storage
• Day
• Daylight saving time
• Dead reckoning
• Death
• Decibel
• Decomposition
• Defecation
• Defensive wall
• Deformation (engineering)
• Degenerate matter
• Degree (angle)
• Delusion
• Dementia
• Dengue fever
• Density
• Dental restoration
• Dentistry
• Dentures
• Dermatology
• Desalination
• Desert
• Detergent
• Developmental biology
• Dew
• Diabetes
• Diamond
• Diarrhea
• Die casting
• Dielectric
• Diesel engine
• Diet (nutrition)
• Dietary supplement
• Diffraction
• Diffraction grating
• Diffusion
• Digestion
• Digital data
• Digital photography
• Diode
• Diphtheria
• Dipole
• Direct current
• Disease
• Dishwasher
• Dispersion (chemistry)
• Dissection
• Distillation
• DNA
• DNA profiling
• DNA replication
• Dock
• Dome
• Domestication
• Door
• Dopamine
• Doppler effect
• Down syndrome
• Drag (physics)
• Drainage basin
• Drilling
• Driving
• Drought
• Drug
• Dry lake
• Dune
• Dust storm
• Dwarf galaxy
• Dwarf planet
• Dye
• Dynamite
• Dysentery
• Dyslexia
• Dysprosium
• Eagle Nebula
• Ear
• Earth science
• Earth's crust
• Earth's inner core
• Earth's magnetic field
• Earth's mantle
• Earth's outer core
• Earthquake
• Eating disorder
• Ebola
• Eclipse
• Ecliptic
• Ecological niche
• Ecology
• Ecosystem
• Eddy current
• El Niño–Southern Oscillation
• Elastic modulus
• Elasticity (physics)
• Electric battery
• Electric charge
• Electric current
• Electric field
• Electric generator
• Electric light
• Electric motor
• Electric potential
• Electric power distribution
• Electric power transmission
• Electrical cable
• Electrical connector
• Electrical engineering
• Electrical grid
• Electrical impedance
• Electrical network
• Electrical resistance and conductance
• Electrical wiring
• Electricity
• Electricity generation
• Electrocardiography
• Electrochemistry
• Electrolysis
• Electromagnet
• Electromagnetic field
• Electromagnetic induction
• Electromagnetic radiation
• Electromagnetic spectrum
• Electromagnetism
• Electromotive force
• Electron
• Electron configuration
• Electron microscope
• Electron shell
• Electronics
• Electronvolt
• Electrostatics
• Elevator
• Elliptical galaxy
• Email
• Embroidery
• Embryo
• Emerald
• Emergency department
• Emergency medical services
• Emulsion
• Enceladus
• Encephalitis
• Encryption
• Endangered species
• Endocrine system
• Endoplasmic reticulum
• Endoscopy
• Energy
• Energy level
• Engine
• Engineering
• ENIAC
• Enthalpy
• Entropy
• Environmental chemistry
• Enzyme
• Epidemic
• Epidemiology
• Epidermis (botany)
• Epigenetics
• Epilepsy
• Epithelium
• Equations of motion
• Equatorial coordinate system
• Equinox
• Equivalence principle
• Erbium
• Eris (dwarf planet)
• Erosion
• Escape velocity
• Esophagus
• Ester
• Estuary
• Ethane
• Ethanol
• Ether
• Ethernet
• Ethology
• Ethylene
• Eukaryote
• Europa (moon)
• Europium
• Evaporation
• Event horizon
• Evolution
• Excretion
• Exercise
• Exoplanet
• Experiment
• Exploration of Mars
• Explosive
• Extinction
• Extinction (astronomy)
• Extinction event
• Extraterrestrial life
• Extratropical cyclone
• Extremophile
• Extrusion
• Eye
• Eye examination
• Face
• Factory
• Fahrenheit
• Farad
• Farm
• Fastener
• Fat
• Fatigue (material)
• Fatty acid
• Fault (geology)
• Façade
• Feather
• Feldspar
• Felt
• Fermentation
• Fermion
• Ferromagnetism
• Fertilisation
• Fertilizer
• Fiber
• Field (physics)
• Field research
• Fighter aircraft
• File system
• Filling station
• Filter (signal processing)
• Filtration
• Finger
• Fingerprint
• Fire
• Firearm
• Fireplace
• Fireworks
• First aid
• Fishing vessel
• Fission (biology)
• Fixed-wing aircraft
• Fjord
• Flagellum
• Flat-panel display
• Flight
• Flood
• Flood management
• Floodplain
• Floor
• Flower
• Fluid dynamics
• Fluid mechanics
• Fluorescence
• Fluorine
• Flux
• Foam
• Focal length
• Focus (optics)
• Fog
• Fold (geology)
• Food group
• Foodborne illness
• Foot
• Foot (unit)
• Force
• Forest
• Forging
• Formaldehyde
• Formation and evolution of the Solar System
• Fortification
• Fossil
• Foundation (engineering)
• Four-stroke engine
• Frame of reference
• Francium
• Freezing
• Freight transport
• Frequency
• Friction
• Frost
• Frostbite
• Fructose
• Fruit
• Fuel
• Functional programming
• Fundamental interaction
• Fungal infection
• Fur
• Fuse (electrical)
• Gadolinium
• Gain (electronics)
• Galactic Center
• Galaxy
• Galaxy formation and evolution
• Galaxy groups and clusters
• Galaxy morphological classification
• Galley
• Gallium
• Gallon
• Gamma ray
• Gamma-ray burst
• Ganglion
• Gangrene
• Ganymede (moon)
• Garden
• Gardening
• Gas
• Gas-turbine engine
• Gasoline
• Gastroenteritis
• Gastroenterology
• Gastrointestinal tract
• Gauge boson
• Gauge theory
• Gear
• Gel
• Gel electrophoresis
• Gemstone
• Gene
• Gene expression
• General relativity
• Genetic code
• Genetic drift
• Genetic engineering
• Genetics
• Geochronology
• Geodesy
• Geologic time scale
• Geological history of Earth
• Geology
• Geomorphology
• Geophysics
• Geostationary orbit
• Geosynchronous orbit
• Geothermal power
• Geriatrics
• Germanium
• Geyser
• Giant planet
• Giant star
• Gill
• Glacial landform
• Glacier
• Gland
• Glass
• Glasses
• Glider (aircraft)
• Global Positioning System
• Gloss (optics)
• Glucose
• Gluon
• Glycogen
• Glycolysis
• Gneiss
• Gold
• Golgi apparatus
• Gout
• Granary
• Granite
• Graphite
• Grassland
• Gravel
• Gravitational acceleration
• Gravitational singularity
• Gravitational wave
• Gravity
• Gravity assist
• Gray (unit)
• Grazing
• Great Attractor
• Great Oxidation Event
• Green
• Greenhouse effect
• Grey
• Ground tissue
• Groundwater
• Gunpowder
• Gypsum
• Gyroscope
• H II region
• Haber process
• Habitat
• Hadley cell
• Hadron
• Hafnium
• Hail
• Hair
• Halley's Comet
• Hallucination
• Haloalkane
• Halogen
• Hamiltonian mechanics
• Hammer
• Hand
• Hand spinning
• Hand, foot, and mouth disease
• Harbor
• Hard disk drive
• Harmonic oscillator
• Harrow (tool)
• Harvest
• Head
• Health
• Health care
• Health effects of smoking tobacco
• Hearing
• Hearing loss
• Heart
• Heat
• Heat capacity
• Heat transfer
• Heat treating
• Heating, ventilation, and air conditioning
• Hectare
• Helicopter
• Helium
• Helmet
• Hematology
• Hemoglobin
• Hepatitis
• Herbal medicine
• Herbivore
• Heredity
• Hertz
• Hertzsprung–Russell diagram
• Hibernation
• Higgs boson
• High-pressure area
• High-speed rail
• Highway
• Hill
• History of atomic theory
• History of Earth
• History of life
• HIV/AIDS
• Hoe (tool)
• Holmium
• Holocene
• Holography
• Home appliance
• Hooke's law
• Horizon
• Hormone
• Horsehead Nebula
• Horses in warfare
• Horticulture
• Hospital
• Hot air balloon
• Hot spring
• Hotspot (geology)
• Hour
• Hovercraft
• HTML
• HTTP
• Hubble Space Telescope
• Hubble's law
• Human body
• Human brain
• Human evolution
• Human eye
• Human genome
• Human leg
• Human skeleton
• Human tooth
• Human voice
• Humidity
• Hyades (star cluster)
• Hybrid (biology)
• Hydrocarbon
• Hydrochloric acid
• Hydroelectricity
• Hydrofluoric acid
• Hydrogen
• Hydrogen bond
• Hydrogen peroxide
• Hydrography
• Hydrology
• Hydropower
• Hydrosphere
• Hygiene
• Hypertension
• Hypha
• Hypothermia
• Hypoxia (medicine)
• Ice
• Ice age
• Ice sheet
• Ice shelf
• Iceberg
• Ideal gas law
• Igneous rock
• Image scanner
• Imago
• Immune system
• Immunology
• Impact crater
• Impact event
• Imperial units
• Impulse (physics)
• Incandescent light bulb
• Inch
• Inclined plane
• Indium
• Inductance
• Inductor
• Industrial engineering
• Industrial robot
• Inertia
• Infection
• Inflammation
• Influenza
• Information science
• Information technology
• Infrared
• Injury
• Ink
• Inorganic chemistry
• Inorganic compound
• Instinct
• Instrumentation
• Insulin
• Integrated circuit
• Integumentary system
• Intellectual disability
• Intelligence
• Intensive farming
• Interchangeable parts
• Interferometry
• Intermolecular force
• Internal combustion engine
• Internal energy
• Internal structure of Earth
• International Space Station
• International System of Units
• Internet
• Internet protocol suite
• Interplanetary medium
• Interstellar medium
• Invasive species
• Invention
• Io (moon)
• Iodine
• Ion
• Ionic bonding
• Ionization
• Ionizing radiation
• iPhone
• Iridium
• Iron
• Ironing
• Irregular galaxy
• Irrigation
• Irrigation sprinkler
• Islamic calendar
• Island
• Isotope
• Jade
• Java (programming language)
• JavaScript
• Jaw
• Jet aircraft
• Jet engine
• Jet stream
• Joint
• Joule
• Julian calendar
• Jungle
• Jupiter
• Jurassic
• Kaolinite
• Karst
• Kelvin
• Kepler's laws of planetary motion
• Kerosene
• Ketone
• Kidney
• Kilogram
• Kinematics
• Kinetic energy
• Kingdom (biology)
• Kirchhoff's circuit laws
• Knife
• Knitting
• Knot
• Knot (unit)
• Krypton
• Kuiper belt
• Köppen climate classification
• Laboratory
• Lace
• Lactic acid
• Lactose
• Ladder
• Lagoon
• Lagrange point
• Lagrangian mechanics
• Lake
• Land transport
• Landform
• Landslide
• Lanthanide
• Lanthanum
• Large Hadron Collider
• Large intestine
• Large language model
• Large Magellanic Cloud
• Larva
• Laser
• Laser cutting
• Late Devonian mass extinction
• Late Ordovician mass extinction
• Lathe
• Launch vehicle
• Laundry
• Lava
• Lawn mower
• Laws of thermodynamics
• Lead
• Leaf
• Leap year
• Leather
• Lens
• Lenticular galaxy
• Leprosy
• Lepton
• Leukemia
• Levee
• Lever
• Life
• Life expectancy
• Lift (force)
• Ligament
• Light
• Light-emitting diode
• Light-year
• Lighthouse
• Lighting
• Lightning
• Limestone
• Limnology
• Linen
• Linux
• Lipid
• Liquid
• Liquid-crystal display
• Lithium
• Lithosphere
• Litre
• Liver
• Local Group
• Lock (water navigation)
• Lock and key
• Locomotive
• Longevity
• Loom
• Lorentz force
• Lorentz transformation
• Loudspeaker
• Low Earth orbit
• Low-pressure area
• Lumbar puncture
• Lumber
• Lumen (unit)
• Luminosity
• Lunar eclipse
• Lung
• Lung cancer
• Lutetium
• Lux
• Lyme disease
• Lymphatic system
• Lymphoma
• Lysosome
• Mac (computer)
• Machete
• Machine
• Machine learning
• Machine press
• Magma
• Magnesium
• Magnesium sulfate
• Magnet
• Magnetic field
• Magnetic resonance imaging
• Magnetic tape
• Magnetism
• Magnetostatics
• Magnitude (astronomy)
• Mail
• Main sequence
• Major depressive disorder
• Major trauma
• Malaria
• Malnutrition
• Malware
• Manganese
• Mangrove
• Marble
• Maritime transport
• Mars
• Marsh
• Masonry
• Mass
• Mass production
• Mass spectrometry
• Mass–energy equivalence
• Materials science
• Matter
• Maxwell's equations
• Meadow
• Meander
• Means of communication
• Measles
• Measurement
• Mechanical engineering
• Mechanics
• Mechanization
• Medical diagnosis
• Medical doctor
• Medical imaging
• Medical test
• Medical ultrasound
• Medication
• Medicinal chemistry
• Medicine
• Meiosis
• Melanin
• Melanoma
• Melting
• Memory card
• Mendelian inheritance
• Meningitis
• Menopause
• Mental health
• Merchant ship
• Mercury (element)
• Mercury (planet)
• Meristem
• Mesa
• Meson
• Mesozoic
• Messier 87
• Metabolism
• Metal
• Metallic bonding
• Metallicity
• Metalloid
• Metallurgy
• Metalworking
• Metamaterial
• Metamorphic rock
• Metamorphosis
• Meteor shower
• Meteorite
• Meteoroid
• Meteorology
• Methane
• Methanol
• Metre
• Metric system
• Metrology
• Mica
• Michelson–Morley experiment
• Microbial cyst
• Microbiology
• Microorganism
• Microphone
• Microscope
• Microsoft Windows
• Microwave
• Microwave oven
• Mid-ocean ridge
• Migraine
• Mile
• Milky Way
• Mineral
• Mineralogy
• Minor planet
• Minute
• Mirage
• Mirror
• Mitochondrion
• Mitosis
• Mixture
• Moat
• Mobile device
• Mobile phone
• Model organism
• Modelling clay
• Mole (unit)
• Molecular biology
• Molecular cloud
• Molecular orbital
• Molecular orbital theory
• Molecule
• Molybdenum
• Moment of inertia
• Momentum
• Monorail
• Monsoon
• Month
• Moraine
• Mortar (weapon)
• Motion
• Motorcycle
• Moulting
• Mountain
• Mountain pass
• Mountain range
• Mouth
• MS-DOS
• Multiple sclerosis
• Mumps
• Muon
• Muscle
• Muscle cell
• Muscle contraction
• Muscular system
• Mushroom poisoning
• Musket
• Mutation
• Mycelium
• Mycology
• Myocardial infarction
• Nail (anatomy)
• Nail (fastener)
• Nanotechnology
• Natural disaster
• Natural gas
• Natural resource
• Natural rubber
• Natural satellite
• Natural selection
• Natural units
• Nature
• Nautical mile
• Naval mine
• Navier–Stokes equations
• Nebula
• Nebular hypothesis
• Neodymium
• Neogene
• Neon
• Neoplasm
• Neptune
• Neptunium
• Nervous system
• Nervous tissue
• Neurology
• Neuron
• Neuroscience
• Neurotransmitter
• Neutrino
• Neutron
• Neutron star
• Newton (unit)
• Newton's law of universal gravitation
• Newton's laws of motion
• Nickel
• Nicotine
• Night
• Niobium
• Nitrate
• Nitric acid
• Nitrogen
• Nitrous oxide
• Noble gas
• Noise
• Nose
• Nova
• Nuclear chemistry
• Nuclear fusion
• Nuclear physics
• Nucleic acid
• Nucleosynthesis
• Nuclide
• Nursing
• Nut (fruit)
• Nut (hardware)
• Nutrition
• Nylon
• Nymph (biology)
• Oasis
• Obesity
• Object-oriented programming
• Observable universe
• Observation
• Observatory
• Occupational safety and health
• Ocean
• Ocean current
• Oceanic trench
• Oceanography
• Odor
• Ohm's law
• Oil drop experiment
• Oil refinery
• Olfactory system
• Omega Centauri
• Oncology
• Ontogeny
• Oort cloud
• Open-source software
• Operating system
• Ophthalmology
• Optical disc
• Optical fiber
• Optical microscope
• Optical telescope
• Optics
• Optometry
• Oral hygiene
• Orange (colour)
• Orbit
• Orbital mechanics
• Orchard
• Ore
• Organ (biology)
• Organelle
• Organic chemistry
• Organic compound
• Organic farming
• Organometallic chemistry
• Organophosphorus chemistry
• Organosilicon chemistry
• Organosulfur chemistry
• Orion Nebula
• Oscillation
• Oscilloscope
• Osmium
• Osmosis
• Otorhinolaryngology
• Ounce
• Outer space
• Oven
• Oxide
• Oxygen
• Ozone
• Ozone depletion
• Pain
• Paint
• Paleogene
• Paleontology
• Paleozoic
• Palladium
• Palliative care
• Pancreas
• Pandemic
• Pangaea
• Paper
• Papyrus
• Parachute
• Parallax
• Parallel computing
• Parasitism
• Parchment
• Parking
• Parkinson's disease
• Parsec
• Particle
• Particle accelerator
• Particle detector
• Particle physics
• Pascal (unit)
• Passenger ship
• Pasteurization
• Pathogen
• Pauli exclusion principle
• Pearl
• Peat
• Pediatrics
• Pedosphere
• Pen
• Pencil
• Pendulum
• Penicillin
• Periodic table
• Peripheral nervous system
• Permafrost
• Permian
• Permian–Triassic extinction event
• Personal computer
• Personal protective equipment
• Personality disorder
• Pesticide
• Petrochemical
• Petroleum
• Petrology
• pH
• Phanerozoic
• Pharmacokinetics
• Pharmacology
• Pharmacy
• Phase (matter)
• Phase diagram
• Phase transition
• Phenol
• Phobia
• Phosphoric acid
• Phosphorus
• Photochemistry
• Photocopier
• Photoelectric effect
• Photographic film
• Photography
• Photometer
• Photometry (astronomy)
• Photon
• Photosynthesis
• Phylogenetics
• Physical chemistry
• Physical cosmology
• Physical disability
• Physical examination
• Physical fitness
• Physical therapy
• Physics
• Physics beyond the Standard Model
• Physiology
• Pier
• Pigment
• Pink
• Pinwheel Galaxy
• Pipe (fluid conveyance)
• Pixel
• Placebo
• Plain
• Planck units
• Plane (tool)
• Planet
• Planetary nebula
• Planetary system
• Plankton
• Plant anatomy
• Plant breeding
• Plant cell
• Plant hormone
• Plant morphology
• Plant reproduction
• Plant stem
• Plasma (physics)
• Plasmid
• Plastic
• Plastic surgery
• Plasticity (physics)
• Plastid
• Plate armour
• Plate tectonics
• Plateau
• Platinum
• Pleiades
• Plough
• Plumbing
• Pluto
• Pneumonia
• Podcast
• Poison
• Polar vortex
• Polaris
• Polarization (waves)
• Polarizer
• Polder
• Polio
• Polio vaccine
• Polonium
• Polyester
• Polyethylene
• Polymer
• Polymer chemistry
• Polymerase chain reaction
• Polypropylene
• Polyvinyl chloride
• Pond
• Population (biology)
• Porcelain
• Port
• Positron
• Post-traumatic stress disorder
• Postage stamp
• Potassium
• Potassium hydroxide
• Potassium nitrate
• Potential energy
• Potter's wheel
• Pottery
• Pound (mass)
• Power (physics)
• Power station
• Power supply
• Prairie
• Praseodymium
• Precambrian
• Precipitation
• Predation
• Prescription drug
• Pressure
• Preventive healthcare
• Primary color
• Principle of relativity
• Printed circuit board
• Printer (computing)
• Printing
• Printing press
• Prion
• Prism (optics)
• Programmed cell death
• Programming language
• Programming paradigm
• Prokaryote
• Promethium
• Propane
• Properties of water
• Propylene
• Prosthesis
• Protactinium
• Protein
• Protein (nutrient)
• Proton
• Protostar
• Psychiatric hospital
• Psychopathy
• Psychosis
• Puberty
• Public health
• Public transport
• Pulley
• Pulmonology
• Pulsar
• Pulse
• Pumping station
• Punched card
• Pupa
• Purple
• Pyroxene
• Qanat
• Quackery
• Qualitative research
• Quantitative research
• Quantum chemistry
• Quantum chromodynamics
• Quantum electrodynamics
• Quantum entanglement
• Quantum field theory
• Quantum gravity
• Quantum mechanics
• Quantum tunnelling
• Quark
• Quarry
• Quartz
• Quasar
• Quaternary
• Quinine
• Rabies
• Radar
• Radian
• Radiation
• Radiation therapy
• Radical (chemistry)
• Radio
• Radio broadcasting
• Radio galaxy
• Radio telescope
• Radio wave
• Radioactive decay
• Radiography
• Radiology
• Radium
• Radon
• Rail transport
• Railway track
• Rain
• Rainbow
• Rainforest
• Rake (tool)
• Random-access memory
• Rapid transit
• Rapids
• Rapier
• Reaction mechanism
• Read-only memory
• Recycling
• Red
• Red blood cell
• Red giant
• Redox
• Redshift
• Reflection (physics)
• Reflex
• Refraction
• Refractive index
• Refrigeration
• Refrigerator
• Relativistic mechanics
• Relay
• Remote control
• Renewable energy
• Research
• Reservoir
• Resistor
• Resonance
• Respiration (physiology)
• Respiratory failure
• Respiratory system
• Reynolds number
• RGB color model
• Rhenium
• Rhodium
• Ribosome
• Rickshaw
• Rifle
• Rigel
• Ring Nebula
• Ring system
• River
• River delta
• Riverboat
• Rivet
• RNA
• Road
• Road transport
• Robot
• Robotics
• Rock (geology)
• Rocket
• Rocket engine
• Rolling (metalworking)
• Roof
• Room
• Root
• Root canal
• Rope
• Rotation
• Router (computing)
• Rubella
• Rubidium
• Ruby
• Ruler
• Ruthenium
• Rutherford scattering experiments
• Saddle
• Sagittarius A*
• Sail
• Sailing
• Sailing ship
• Salt (chemistry)
• Samarium
• Sand
• Sandstone
• Sanitary sewer
• Sanitation
• Sapphire
• Sarcomere
• Satellite
• Satellite navigation
• Satellite television
• Saturn
• Savanna
• Saw
• Scabies
• Scaffolding
• Scale (zoology)
• Scandium
• Scarlet fever
• Scattering
• Scavenger
• Schist
• Schizophrenia
• Schrödinger equation
• Science
• Scientific law
• Scientific method
• Scientific modelling
• Scientific theory
• Scissors
• Screw
• Screw mechanism
• Scroll
• Sea
• Sea ice
• Sea level
• Seabed
• Seamount
• Search engine
• Season
• Sediment
• Sedimentary basin
• Sedimentary rock
• Seed
• Seismology
• Selective breeding
• Selenium
• Semiconductor
• Semiconductor device
• Sense
• Sense of smell
• Sensor
• Sensory nervous system
• Sewage treatment
• Sewing
• Sewing machine
• Sextant
• Sexual dimorphism
• Seyfert galaxy
• Shaving
• Shinkansen
• Ship
• Ship of the line
• Shipbuilding
• Shock (circulatory)
• Shotgun
• Shovel
• Shrubland
• Sickle
• Siemens (unit)
• Sievert
• Signal modulation
• Signal processing
• Signal-to-noise ratio
• Silicate
• Silicon
• Silicone
• Silk
• Silo
• Silver
• Simple harmonic motion
• Simple machine
• Sink
• Siphon
• Sirius
• Skeletal muscle
• Skeleton
• Skin
• Skin cancer
• Skull
• Sky
• Skyscraper
• Slate
• Sleep
• Sling (weapon)
• Small intestine
• Small Magellanic Cloud
• Smallpox
• Smallpox vaccine
• Smartphone
• Smelting
• Smoking
• Smoking cessation
• Snow
• Soap
• Sociality
• Sodium
• Sodium bicarbonate
• Sodium carbonate
• Sodium chloride
• Sodium hydroxide
• Sodium nitrate
• Sodium silicate
• Sodium sulfate
• Software
• Software engineering
• Soil
• Soil fertility
• Soil formation
• Soil science
• Solar cell
• Solar eclipse
• Solar energy
• Solar power
• Solar System
• Solar wind
• Soldering
• Solid
• Solid mechanics
• Solid-state physics
• Solstice
• Solution (chemistry)
• Somatosensory system
• Sonar
• Sound
• Sound recording and reproduction
• Soyuz (spacecraft)
• Space
• Space exploration
• Space station
• Spacecraft
• Spaceflight
• Spacetime
• Spear
• Special relativity
• Species
• Spectrometer
• Spectroscopy
• Speech synthesis
• Speed
• Speed of light
• Speed of sound
• Spin (physics)
• Spinal column
• Spinal cord
• Spiral galaxy
• Spleen
• Spore
• Sporophyte
• Spreadsheet
• Spring (device)
• Spring (hydrology)
• Spring (season)
• Stable
• Stainless steel
• Stairs
• Standard atmosphere (unit)
• Standard Model
• Standardization
• Star
• Star cluster
• Star formation
• Star system
• Starburst galaxy
• Starch
• State of matter
• Statics
• Statistical mechanics
• Stealth technology
• Steam engine
• Steam locomotive
• Steam turbine
• Steamship
• Steel
• Steelmaking
• Stellar black hole
• Stellar classification
• Stellar evolution
• Stellar kinematics
• Stellar magnetic field
• Stellar structure
• Stem cell
• Steppe
• Steradian
• Sterilization (medicine)
• Stethoscope
• Stiffness
• Stimulant
• Stinger
• Stoma
• Stomach
• Storm
• Storm drain
• Stove
• Stratigraphy
• Strength of materials
• Stress (biology)
• Stress (mechanics)
• String theory
• Stroke
• Strong interaction
• Strontium
• Subatomic particle
• Submarine
• Subsistence agriculture
• Substance (chemistry)
• Substance dependence
• Substance use disorder
• Substitution reaction
• Sulfate
• Sulfur
• Sulfuric acid
• Summer
• Sun
• Sundial
• Supercluster
• Supercomputer
• Superconductivity
• Supergiant
• Supermassive black hole
• Supernova
• Superposition principle
• Supersymmetry
• Surface tension
• Surgery
• Suspension (chemistry)
• Sustainability
• Sustainable agriculture
• Swamp
• Switch
• Symbiogenesis
• Symbiosis
• Symmetry (physics)
• Symptomatic treatment
• Syndrome
• Syngas
• Synthetic element
• Syringe
• System
• Talc
• Tank
• Tanker (ship)
• Tannin
• Tantalum
• Tapestry
• Taste
• Tau (particle)
• Taxi
• Taxonomy (biology)
• Technetium
• Technical drawing
• Technology
• Telecommunications
• Telegraphy
• Telephone
• Telescope
• Television
• Tellurium
• Temperate broadleaf and mixed forests
• Temperate climate
• Temperature
• Tendon
• Terbium
• Terrestrial planet
• Tesla (unit)
• Tetanus
• Tevatron
• Text messaging
• Textile
• Thallium
• Theodolite
• Theoretical physics
• Theory of relativity
• Therapy
• Thermodynamic cycle
• Thermodynamic free energy
• Thermodynamics
• Thermohaline circulation
• Thermometer
• Thermoregulation
• Thiol
• Thorax
• Thread (textiles)
• Thrust fault
• Thulium
• Thunderstorm
• Thyroid
• Tidal locking
• Tide
• Tillage
• Time zone
• Tin
• Tire
• Tissue (biology)
• Titan (moon)
• Titanium
• Titanium dioxide
• Tobacco
• Toilet
• Ton
• Tongue
• Tool
• Tooth decay
• Toothache
• Tornado
• Torpedo
• Torque
• Touchscreen
• Tower
• Tower block
• Toxicity
• Toxicology
• Tractor
• Trade winds
• Traditional Chinese medicine
• Traditional medicine
• Traffic collision
• Trail
• Train
• Train station
• Tram
• Transcription (biology)
• Transformer
• Transistor
• Transition metal
• Translation (biology)
• Transparency and translucency
• Transpiration
• Transport
• Triangulum Galaxy
• Triassic
• Triassic–Jurassic extinction
• Triple point
• Triton (moon)
• Tropical climate
• Tropical cyclone
• Tropical rainforest
• Truck
• Trunk (botany)
• Tsunami
• Tuberculosis
• Tuff
• Tundra
• Tungsten
• Tunnel
• Turbine
• Turbulence
• Typewriter
• Typhoid fever
• Typhus
• Ultimate fate of the universe
• Ultrasound
• Ultraviolet
• Uncertainty principle
• Unit of measurement
• United States customary units
• Universe
• Unix
• Unmanned aerial vehicle
• Uranium
• Uranus
• Urea
• Urinary system
• Urology
• Ursa Major
• Ursa Minor
• User interface
• Vaccination
• Vaccine
• Vacuole
• Vacuum
• Vacuum cleaner
• Vacuum tube
• Valence bond theory
• Valley
• Valve
• Vanadium
• Vapor
• Variable star
• Vascular cambium
• Vascular tissue
• Vega
• Vegetative state
• Vehicle
• Vein
• Velocity
• Venom
• Venus
• Veterinary medicine
• Video
• Video camera
• Virgo Cluster
• Virgo Supercluster
• Viscosity
• Visible spectrum
• Visual impairment
• Visual perception
• Visual system
• Vitamin
• Void (astronomy)
• Volcano
• Volt
• Voltage
• Voyager program
• W and Z bosons
• Walker circulation
• Wall
• Warehouse
• Washing machine
• Waste
• Waste management
• Watch
• Water
• Water cycle
• Water purification
• Water supply network
• Water tower
• Water vapor
• Waterfall
• Watermill
• Watt
• Wave
• Wave equation
• Wave function
• Wave interference
• Waveguide
• Wavelength
• Wave–particle duality
• Weak interaction
• Weather
• Weather forecasting
• Weather front
• Weathering
• Weaving
• Web browser
• Wedge
• Week
• Weighing scale
• Weight
• Weight loss
• Welding
• Well
• West Nile fever
• Wetland
• Wheel
• Wheel and axle
• Wheelbarrow
• Wheelchair
• Whirlpool Galaxy
• Whiskers
• White
• White blood cell
• White dwarf
• Whooping cough
• Wi-Fi
• Wildfire
• Wildlife conservation
• Wind
• Wind power
• Wind turbine
• Windmill
• Window
• Wing
• Winter
• Wire
• Wolf–Rayet star
• Wood
• Woodworking
• Wool
• Word processor
• Work (physics)
• World Wide Web
• Wound
• Wrought iron
• X-ray
• Xenon
• Yarn
• Year
• Yellow
• Yellow fever
• Ytterbium
• Yttrium
• Zinc
• Zirconium
• Zoology