Something Unsettling Happens when You Separate Twins at Birth

Why It Matters

These findings reshape expectations for public health, education and personal choice by quantifying how much of behavior, disease risk and lifespan are inherited versus modifiable, informing prevention strategies and policy priorities. Understanding the genetic contribution helps target interventions where environment still matters most and calibrates realistic expectations about the limits of behavior change.

Summary

The video traces landmark twin research—from the Minnesota Study of Twins Reared Apart to large Scandinavian registries and the NASA twin experiment—showing striking genetic influences on personality, interests, medical history and even biomarkers. Separated identical twins often shared hobbies, careers, habits and similar brain and medical profiles, suggesting genes can strongly shape behavior and the environments people seek out. Large registry analyses find that many cancers and dementia outcomes are more environmentally driven, though some conditions (prostate, colorectal, breast cancer) show substantial heritability, and estimates of genetic influence on lifespan have risen toward roughly 50%. The piece frames twin studies as the clearest evidence that both heredity and environment matter, with genetics playing a larger role in many traits and in steering individual life paths than previously thought.

Original Description

What happens when you separate identical twins are birth?

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Today we're looking at some of the wildest twin studies and research to finally answer the question of Nature vs Nurture. What's more important: your genes or your environment? Are you born smart or does your school matter more?

Sources and Further Reading:

https://embryo.asu.edu/pages/sources-human-psychological-differences-minnesota-study-twins-reared-apart-1990-thomas-j

https://www.psypost.org/major-iq-differences-in-identical-twins-linked-to-schooling-challenging-decades-of-research/

https://www.sciencedirect.com/science/article/pii/S0001691825003853?via%3Dihub

https://ki.se/en/research/research-infrastructure-and-environments/core-facilities-for-research/the-swedish-twin-registry

https://www.nasa.gov/humans-in-space/nasas-twins-study-results-published-in-science-journal/

https://www.nature.com/articles/ng.3285

https://pubmed.ncbi.nlm.nih.gov/23919982/