As Fritz and his team found, music and the emotions it conveys are cultural universals.

In the U.S., by contrast, individuals are expected to leave home and live independently for a period before forming a family unit that consists of parents and their offspring

But when boarding a bus in Cairo, Egypt, passengers might board while the bus is moving, because buses often do not come to a full stop to take on patrons.

In other nations and in other times, marriages have been arranged through an intricate process of interviews and negotiations between entire families. In Papua New Guinea, almost 30 percent of women marry before the age of 18, and 8 percent of men have more than one wife (National Statistical Office, 2019).