algorithm
Ages 8-12
A step-by-step recipe for solving a problem.
Ages 13-16
A finite, well-defined sequence of operations that solves a class of problems.
The Smart Kids Glossary
Plain-language definitions of the 37 technical terms that appear across the Parker Smart Kids lessons, from amygdala to utilitarian. Each one comes in two versions: a simple definition for ages 8 to 12 and a more precise one for ages 13 to 16.
amygdala
Ages 8-12
A part of the brain that helps you feel emotions like fear and excitement.
Ages 13-16
An almond-shaped brain region that processes emotion and emotional memory, especially fear.
anecdotal
Ages 8-12
Based on one person's story instead of careful study.
Ages 13-16
Evidence drawn from personal accounts or isolated cases rather than systematic research.
causation
Ages 8-12
When one thing actually makes another thing happen.
Ages 13-16
A relationship in which one event produces another; harder to establish than correlation and typically requires controlled experiments.
cognitive dissonance
Ages 8-12
The uncomfortable feeling when you believe one thing but do another.
Ages 13-16
The mental tension produced by holding two contradictory beliefs, attitudes, or behaviors simultaneously (Festinger, 1957).
confirmation bias
Ages 8-12
The habit of only noticing things that match what you already believe.
Ages 13-16
The tendency to favor information that confirms existing beliefs and discount disconfirming evidence.
confound
Ages 8-12
A hidden third thing that makes a study's results misleading.
Ages 13-16
A variable that influences both the supposed cause and the supposed effect, creating a spurious relationship.
constitutional
Ages 8-12
Having to do with a country's most important set of laws.
Ages 13-16
Pertaining to the foundational legal framework that defines a state's powers, rights, and structure.
correlation
Ages 8-12
When two things tend to happen together, but one might not be causing the other.
Ages 13-16
A statistical relationship in which two variables move together, which does not by itself establish causation.
cuticle
Ages 8-12
The thin outer layer that protects hair or nails.
Ages 13-16
The protective outer layer of a hair shaft made of overlapping flat cells.
decolonization
Ages 8-12
When countries that used to be ruled by other countries become independent.
Ages 13-16
The process by which colonies became self-governing states, especially across Africa and Asia from 1945 onward.
determinism
Ages 8-12
The idea that everything that happens was set in motion by earlier causes.
Ages 13-16
The philosophical view that all events, including human choices, are the inevitable consequence of prior causes.
diaphragm
Ages 8-12
The big flat muscle below your lungs that pulls air in when you breathe.
Ages 13-16
A dome-shaped sheet of muscle below the lungs; its contraction expands the chest cavity to draw air in.
elasticity
Ages 8-12
How much people change what they buy when the price goes up or down.
Ages 13-16
The proportional responsiveness of demand or supply to a change in price or other variable.
fermentation
Ages 8-12
When tiny living things like yeast turn sugar into gas or alcohol.
Ages 13-16
A metabolic process in which microorganisms convert sugars into acids, gases, or alcohols in the absence of oxygen.
gluten
Ages 8-12
A stretchy protein in wheat that lets bread hold its shape.
Ages 13-16
A complex of proteins (gliadin and glutenin) in wheat that gives dough elasticity.
glymphatic
Ages 8-12
A system in the brain that washes out waste, mostly while you sleep.
Ages 13-16
A waste-clearance system that uses cerebrospinal fluid to flush metabolic byproducts from brain tissue, most active during sleep.
hippocampus
Ages 8-12
A small part of the brain that stores new memories.
Ages 13-16
A brain region in the medial temporal lobe central to forming and retrieving long-term memories.
machine learning
Ages 8-12
When a computer learns patterns from lots of examples instead of being told the rules.
Ages 13-16
Algorithms that improve performance on a task by training on data rather than following hard-coded rules.
marginal utility
Ages 8-12
The extra usefulness you get from one more of something — usually less each time.
Ages 13-16
The additional satisfaction gained from consuming one more unit of a good; generally diminishing as quantity rises.
meta-analysis
Ages 8-12
A study that combines results from many studies to see the big picture.
Ages 13-16
A statistical method that combines effect sizes across multiple independent studies to estimate a pooled result.
olfactory bulb
Ages 8-12
The part of your brain that handles smells, right behind your nose.
Ages 13-16
The brain structure that receives signals from smell receptors and forwards them — uniquely — directly to memory and emotion centers.
placebo
Ages 8-12
A fake treatment that has no real medicine in it.
Ages 13-16
An inert intervention given as a control in clinical trials to distinguish drug effects from expectation effects.
prologue
Ages 8-12
The introduction at the start of a long text or story.
Ages 13-16
An opening passage that frames the work that follows, common in epic poetry, plays, and ancient legal codes.
qubit
Ages 8-12
A bit on a quantum computer that can be 0, 1, or both at once.
Ages 13-16
A quantum bit; the basic unit of quantum information, capable of superposition between |0⟩ and |1⟩ states.
rent extraction
Ages 8-12
When a business uses its power to charge more than its work is really worth.
Ages 13-16
Profit earned beyond the value created, typically through market power, regulatory capture, or scarcity.
reparations
Ages 8-12
Money or goods that one country pays to another after losing a war.
Ages 13-16
Compensation paid by a defeated state for damages caused during conflict; central to the 1919 Treaty of Versailles.
replication crisis
Ages 8-12
A problem in science where many old studies don't get the same results when redone.
Ages 13-16
The phenomenon, prominent since 2010, in which a substantial fraction of published research fails to replicate when independently re-tested.
resonance
Ages 8-12
When small pushes at just the right rhythm make something shake hard, like a swing going higher.
Ages 13-16
A phenomenon in which an oscillating system absorbs energy efficiently from a driving force matching its natural frequency.
selection bias
Ages 8-12
When a study leaves out important people, so its results don't match the real world.
Ages 13-16
A systematic distortion arising when the sample studied is not representative of the population of interest.
separation-individuation
Ages 8-12
The process of becoming your own person, separate from your parents.
Ages 13-16
A developmental process (Margaret Mahler, 1970s) in which a child forms an identity distinct from caregivers while still attached to them.
stablecoin
Ages 8-12
A digital coin whose value stays close to a regular currency like the dollar.
Ages 13-16
A cryptocurrency designed to maintain a pegged value to an external asset, typically the US dollar.
statistical significance
Ages 8-12
A way to check whether a result is real or just lucky chance.
Ages 13-16
The likelihood that an observed effect did not occur by chance alone; usually expressed as a p-value below 0.05.
stele
Ages 8-12
A tall stone pillar with words carved on it, used in ancient times.
Ages 13-16
An upright stone slab inscribed with text or images, used by ancient civilizations as a public monument.
synaptic homeostasis
Ages 8-12
An idea that sleep helps your brain reset the connections between brain cells.
Ages 13-16
A theory (Tononi & Cirelli) that sleep downscales synaptic strength accumulated during waking learning.
the harm principle
Ages 8-12
John Stuart Mill's idea that you should only stop someone from doing something if it hurts other people.
Ages 13-16
Mill's 1859 principle that the only legitimate justification for restricting individual liberty is to prevent harm to others.
utilitarian
Ages 8-12
Judging actions by how much happiness they create for the most people.
Ages 13-16
An ethical framework (Bentham, Mill) that holds the rightness of an action depends on its consequences for overall well-being.
Frequently asked questions
How do you explain hard words to kids?
Give a child two layers: a short, concrete definition they can picture, and a more precise one they can grow into. Every term in this glossary has both, an ages 8 to 12 version and an ages 13 to 16 version, so the same word works at any stage.
Why teach kids technical vocabulary at all?
Words are handles for ideas. A child who knows what correlation, base rate, or confirmation bias mean can reason about the world more precisely and is much harder to mislead, because they can name the move being used on them.
What is the difference between correlation and causation?
Correlation means two things tend to happen together; causation means one actually makes the other happen. Two things can move together because of luck or a hidden third cause, so correlation alone never proves causation.
These words show up inside real lessons, where kids meet them in context, not on flashcards.
Try a free lesson Browse Thinking Tools