When people must share things, what does it mean to share fairly? Do all people around the world have the same idea of what is fair or unfair? Are humans born with a feeling about what is fair and unfair, or is it something we learn as we grow up? Scientists study how people from different cultures choose to share things in various situations, and whether people think different ways of sharing are fair or unfair. The article describes an experiment in which scientists studied whether children from different cultures have different ideas about what is fair. These studies are important for understanding how humans are similar and different from each other and from other animals, and they also help us understand how we can work to create a world that is considered fair by everyone.