Sex Differences in Children's Motivation and Action Patterns for Climbing as Behavioral Relicts of Ancestral Sexual-Size Dimorphism by Richard G. Coss, Victor K. Geisler, Michael Newmann

“…Study 1 examined yearly incidences of children aged 3 to 13 falling from monkey bars and jungle gyms in a 1985–1989 National Electronic Injury Surveillance System dataset. …”
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