There are universals when it comes to raising kids: A child needs enough sleep, food, and nurturing to thrive. But how we meet those necessities varies wildly depending on your latitude. French children are taught to eat mussels and stinky cheeses. Fathers in the African Aka pygmy tribe are intimately involved with childcare. They strap their infants into slings and take them on elephant hunts, and will even offer a nipple to soothe a fussy baby. The Chinese potty train their little ones starting at 6 months. (Their secret: pants that split along the butt seam.) Unlike American parents who intervene when kids scuffle, many Japanese let them fight with minimal intervention so they can learn to live harmoniously in a group setting.