Darker cells mean a higher score for this topic on that metric.
LessMore
Last reviewed Sources & creditsMedia creditsMethodology
Quick answers
Does this atlas rank groups by IQ, race or nation?
No. Pathways and evidence stay individual. Scores are browsing aids — never group biological or racial ranks.
Did Galton settle the question?
Galton named the English contrast and promoted pedigree thinking. He did not have twin or molecular designs. Later work discarded his racial hierarchy project.
What do twin studies actually show?
When raised apart or compared as MZ versus DZ pairs, many cognitive and personality traits show substantial genetic influence and surprisingly small effects of the shared family home — in the environments those studies sampled.
Does a high heritability mean training is pointless?
No. Height is highly heritable and still responds to nutrition. Heritability is not unmodifiability.
Why refuse group IQ rankings here?
Between-group score gaps are not a clean genetic ranking. They confound tests, opportunity, health, language and history. This atlas will not launder that confusion as science.
What is gene–environment correlation?
People seek, evoke and are placed in environments that fit their dispositions — music lessons after a parent hears pitch, or a maths circle after a teacher notices speed. Genes and culture then travel together.
The people below are a history set for nature and nurture, diverse in country and gender, not a league table.
Years and countries are real. “Why” is a file label, not a rank. No group IQ story is licensed by any of these lives.
Exemplars
- Francis Galton 1822–1911 · United Kingdom
Named the contrast Coined the English slogan and built pedigree science that later eugenics weaponised. Read as history, not as a manual.
- Charles Spearman 1863–1945 · United Kingdom
Factor g Showed that cognitive tests intercorrelate. The math is not a racial hierarchy.
- Barbara Burks 1902–1943 · United States
Early adoption design Tried to unconfound home and pedigree in California data — a design ancestor, not a final word.
- Lev Vygotsky 1896–1934 · Soviet Union
Social development Made assisted performance the unit of teaching. A nurture mechanism with theoretical teeth.
- Jean Piaget 1896–1980 · Switzerland
Stage theory Mapped how thinking changes with age. Stages are not talent ranks.
- Sandra Scarr 1936–2021 · United States
Good-enough environments Argued many homes are functionally similar for some outcomes; schools still dispute the threshold.
- Thomas Bouchard 1937– · United States
Reared-apart twins Led the Minnesota project that made genetic influence a 1980s media fact.
- Robert Plomin 1948– · United Kingdom
Behavioural genetics Long-running twin and genomic programme. Useful on methods; not a licence for classroom DNA gates.
Nature and nurture: eight lives, not a ranking. Read them as files, not as a hierarchy of peoples.
OriginsScienceSignsDevelopPracticeExemplarsMyths In this language region