Argues that the male brain is naturally wired for analytical problem-solving rather than emotional empathy when faced with a crisis.

: During puberty, a massive surge in testosterone increases the "sexual pursuit" area of the male brain to 2.5 times the size of that in females. This change also makes teen boys perceive others' faces as more aggressive, lowering their threshold for conflict.

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Describes the hormonal shift in fathers, where testosterone drops and prolactin (the "Mr. Mom" hormone) increases to stimulate nurturing instincts.