Non-Shared Environment Doesn’t Just Mean Schools And Peers

[Uncertain] An important, clarifying behavioral-genetics correction: the '50% non-shared environment' in twin studies is not 'schools and peers' but a DUMPSTER holding measurement error, luck, and biological noise (developmental randomness, the immune system, epigenetics, ~359 post-zygotic mutations per identical pair) — not nurture as usually conceived. Cites Riemann & Kandler (personality jumps to ~85% genetic once multi-measure averaging strips error) and Turkheimer's 'Gloomy Prospect' (specific nonshared-environment effects are tiny once confounds are controlled). Implication: nature matters more, and environmental levers less, than the '50/50' summary suggests. Widely-cited debunk of a common twin-study misreading.

Quality 73 · Strong. Strong (73): a genuinely clarifying, much-referenced correction with real conceptual payoff (non-shared environment != nurture); held below Excellent as Scott flags uncertainty and it interprets existing findings.

Claude’s paradigm shift 54 · Moderate. Moderate (54): the 'non-shared environment is mostly error/luck/biology, not schools and peers' reframe is a fresh, non-obvious contribution.

Real-world impact 3 · Moderate. Moderate (3): circulates widely in behavioral-genetics-literate rationalist/HBD discussion; niche footprint.