Three-year-old Kwara'ae children in Oceania act as caregivers of their younger siblings, but in the UK, it is an offense to leave a child under age 14 ears without adult supervision. In the Efe community in Zaire, infants routinely use machetes with safety and some skill, although U.S. middle-class adults often do not trust young children with knives. What explains these marked differences in the capabilities of these children?
Until recently,...