PROOF

These are just some examples of things that consists of three parts.  As you go about your day, start noticing things around you that list three parts to complete it.  Such as... "Hotter. Juicier. Tastier." hamburger slogan.  "Snap! Crackle! Pop!" cereal slogan. "Work. Play. Eat." hotel slogan.  "Whatever. Wherever. Whenever." car slogan.  The examples are practically endless!

Don't take my word for it, go to the internet and verify each topic below for yourself.  It's really quite remarkable that life works this way.

How Life Works in Threes 

LIFE 

• Humans consist of body, mind and soul. 
• A human’s basic needs are health, income and provisions.  
• A human’s basic wants are comfort, gain and approval.  
• Our minds are made up of the conscious, the subconscious and the unconscious.  
• Philosophy explains the id, the ego and superego.  
• Atoms consist of protons, neutrons and electrons.  
• Motion is explained by three basic laws.  
• Science falls under three main branches: natural, social and formal sciences  
• Time is past, present and future…at the same time.  
• Electricity consists of ohms, amperes and voltage.  
• Music’s basic elements are duration, pitch and timbre.  
• Democracy is a government of the people, by the people and for the people.  
• U.S. branches of government are the judicial, the executive and the legislative. 
• Armed Forces protect us on land, air and sea.  
• Environmentally, we are asked to reduce, recycle and re-use.  
• The news program gives us the news, sports and conditions.  
• Our days consist of morning, afternoon and evening.  
• Three months in each season of the year 
• Our main meals are known as breakfast, lunch and dinner.  
• A balanced diet consists of good proteins, carbohydrates and fats. 
• Traditional Family consists of father, mother, and child(ren) 

SCIENCES 

• Three major branches of natural science – (physical, earth/space and life sciences) 
• Three major branches of modern physics - (classical, relativistic, quantum) 
• Three major branches of biology (botany, zoology, microbiology) 
• Three spatial dimensions: height (up/down), width (left/right) and depth (forwards/backwards) 
• Three-gauge bosons (photon, gluon, W&Z bosons) 
• Three types of elementary particles (leptons, quarks, gauge bosons) 
• Three quarks in every proton (two “up” and one “down”) 
• Three primary colors of light (red, green, blue) 
• Three color tone properties (hue, value, chroma) 
• Three laws of motion (Newton’s laws) 
• Three laws of planetary motion (Kepler’s laws) 
• Three layers of the Sun’s interior (core, radiative zone, convective zone) 
• Three layers of the Sun’s atmosphere (photosphere, chromosphere, corona) 
• Three types of meteorites (iron, stony iron, stony) 
• Three types of galaxy shapes (elliptical, spiral, irregular) 
• Three substances of the universe (normal matter, ‘dark matter’, ‘dark energy’) 
• Three phases of the moon (new moon, first quarter, full moon) 
• Three planetary regions (temperate, sub-tropical, tropical) 
• Three layers of the Earth (crust, mantle, core) 
• Three components of an ecosystem (producers, consumers, decomposers) 
• Three types of rocks (igneous, sedimentary, metamorphic) 
• Three types of fossil fuels (coal, crude oil, natural gas) 
• Three hydrological processes (evaporation, condensation, precipitation) 
• Three basic types of (meteorological) precipitation (liquid, freezing, frozen) 
• Three types of substances (mono-constituent, multi-constituent, UVCB) 
• Three phases of (normal) matter (solid, liquid, gas)  
• Three types of covalent chemical bonds (single, double and triple bonds) 
• Three isotopes of hydrogen (protium, deuterium, tritium) 
• Three atoms in each molecule of water (two hydrogen atoms and an oxygen atom) 
• Three endings to salts (-ide, -ite, -ate) 
• Three requirements for fire (fuel, oxygen, heat) 
• Three nucleotide bases in a genetic codon 
• Three domains of life (archaea, bacteria and eukaryotes) 
• Three major groups of flowering plants (monocots, eudicots, magnoliids) 
• Three major functions that are basic to plant growth and development: (photosynthesis [making sugars], respiration [metabolizing those sugars], and transpiration [water vapor loss] 
• Three things that the chlorophyll in plants needs for photosynthesis to take place: (sunlight, carbon dioxide and water) 
• Transpiration serves three roles: (cooling the plant, moving minerals and sugars through the plant, and maintaining the turgidity pressure [stiffness] of the plant's cells) 
• Three parts of an insect's body (head, thorax, abdomen) 

BIOLOGY 

• Three types of cones in the retina, relating to the three primary colors 
• Three semi-circular canals in the ear (lateral, anterior, posterior) 
• Three sections in the ear (outer, middle, inner) 
• Three ossicles in the middle ear (malleus, incus, stapes) 
• Three segments to each limb (proximal, mid, distal) 
• Three bones in each arm (humerus, radius, ulna) 
• Three joints in the arm (shoulder, elbow, wrist) 
• Three joints in the leg (hip, knee, ankle) 
• Three joints in the elbow (humeroulnar, humeroradial, proximal radioulnar) 
• Three functional compartments in the knee joint (the femoropatellar, medial femorotibial and lateral femorotibial articulations) 
• Three types of fibrous joints (sutures, gomphoses, syndesmoses) 
• Three types of bone in each hand (carpals, metacarpals, phalanges) 
• Three types of bone in each foot (tarsals, metatarsals, phalanges) 
• Three bones (phalanges) in each finger and in each toe (proximal, intermediate, distal) 
• Three layers of skin (dermis, epidermis, hypodermis) 
• Three components of a cell (cell membrane, nucleus, cytoplasm) 
• Three types of blood vessels (arteries, veins, capillaries) 
• Three types of blood cells [red (erythrocytes), white (leukocytes), platelets (thrombocytes)] 
• Three processes of the intestinal tract (ingestion, digestion, excretion) 
• Three germ layers (Endoderm, Mesoderm, Ectoderm) 
• Three parts of a human tooth (crown, neck, root) 
• Three organs of otolaryngology (ear, nose, throat) 
• Three major body systems (digestive, circulatory, respiratory) 
• Three parts to a neuron: (soma [cell body], axon, dendrites) 
• Three main parts of the brain (forebrain, midbrain, hindbrain) 
• Three parts of the forebrain (cerebrum, thalamus, hypothalamus) 
• Three parts of the midbrain (colliculi, tegmentum, cerebral peduncles) 
• Three parts of the hindbrain (cerebellum, pons, medulla) 
• Three membranes enclosing the brain (dura mater, arachnoid, pia mater) 
• The brain operates on three levels: consciously (for cognitive thought and declarative memory); subconsciously (for pre-planned actions and procedural memory); and unconsciously (for breathing, heart beating, etc.) 
• Our conscious mind is fed from three sources: our senses (which can be fooled); our memory (which is flawed); and our imagination (which is inventive) 
• Three aspects of the human mind (memory, intellect, will) 
• Three parts of the human personality (id, ego, superego) 
• The sum of human capacity consists of three abilities (thought, word and deed) 
• Three times of man (birth, life, death) 
• Three periods of the Gait Cycle (initial double limb support, single limb support, and terminal double limb support) 

(There are another 100 examples listed in each E-book I've written.)