Questions

The raw test-score advantage of single-sex schools is real but driven by which families choose them — private governance, religious management, and academic selectivity explain most or all of it. No credible study finds a meaningful benefit from gender separation itself, for either sex, once these factors are removed. The evidence base is narrow (Seoul, Trinidad and Tobago, 1970s Britain) and may not generalize to the settings where this debate is loudest.

No credible evidence shows that dyslexic people start businesses at higher rates or succeed more often when they do. The widely cited claim that 35% of entrepreneurs are dyslexic comes from a single study (Logan 2009) with an unvalidated screening tool and a 7% response rate. No study has measured actual business outcomes — survival, revenue, or income — for dyslexic versus non-dyslexic entrepreneurs.

Marriage does not harm women. Married women live longer and report better mental health than unmarried women — the benefit is simply smaller than men's. The 'marriage hurts women' claim originated in the 1970s from studies that compared married women to married men rather than to unmarried women, answering the wrong question. Whether marriage itself causes the longevity benefit, or healthier people are more likely to marry, remains unsettled.