Interesting Study: Testicle Size vs. Paternal Behavior
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I know many of us think about gender roles and physiology. Here's a story about an interesting study which looks at how the size of a man's testicles might affect how he relates to his children.
http://www.bbc.co.uk/news/health-24016988
Spoiler: Men with smaller testicles, on average, take a more nurturing role in child rearing.