Snapshot · Modern Wisdom
The sex difference in verbal aggression has an effect size of about 0.5, but for homicide the gap is enormous — men perpetrate 90%+ of killings in every nation where data exists.
Where this was said
At 2:03:23 · chapter starts 1:58:59
Both sexes are prone to jealousy, but the triggers differ systematically. For men, sexual infidelity is typically more distressing than emotional infidelity because it introduces paternity uncertainty — the only species-wide reproductive threat unique to males. For women, emotional infidelity tends to be more distressing because it signals probable desertion: a partner who falls in love with someone else is likely to leave, which was historically catastrophic for a woman with dependent children. This asymmetry generates different mate-guarding behaviour: men are more focused on monitoring sexual access, women on monitoring emotional commitment. A 23andMe anecdote about a paternal affair discovered three decades later prompts a discussion of how jealousy evolved as a gut reaction that fires regardless of whether the evolutionary circumstances still apply — another illustration of proximate versus ultimate causation.
The verbal aggression gap between men and women is modest. The physical aggression gap is bigger. For homicide, it's enormous — men perpetrate over 90% of killings in every nation where data exists. The same pattern appears in chimpanzees, where males commit 92% of chimpicides. This is reproductive variance made lethal.
The widely cited ego-depletion model — the idea that willpower is a finite resource that gets depleted — failed to replicate in follow-up studies.
Humans are estimated to have 5,000–7,000 thoughts per day, yet can recall essentially none of them afterward, highlighting why in-the-moment emotional tracking matters.
A large Harvard study found that a wandering mind is an unhappy mind — people report greater happiness when their attention is tethered to the present, even if the task is unpleasant.
A key study finding that we have a 'credit card's worth of plastic' in our bodies was likely skewed because researchers used nitrile gloves that shed plastic particles onto the microplastic detector.
Emotionally sensitive people have a hyperactive amygdala, an underactive prefrontal cortex, and a frayed connection between the two — making emotional regulation structurally harder.
Rejection sensitivity can be observed as early as age 2 or 3, suggesting it has strong developmental and likely genetic roots.
A Yale study found that non-judgmental observation of emotions — without rushing to resolve them — reduces activation in the brain, making it a powerful regulation tool.
Dan Gilbert's research found that the psychological immune system — the brain's ability to justify and find satisfaction in choices — activates most powerfully when a decision is perceived as irreversible.
Barry Schwartz's research found that maximizers — people who try to optimize every decision — tend to achieve objectively better outcomes but report lower happiness than satisficers who choose 'good enough.'
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