In a colorfully decorated classroom, a five-year-old boy is asked to describe his favorite belonging. He talks effusively about the dinosaur T-shirt his mom forced him to put in the wash that morning. Then he plays two simple computer games, trying, of course, to win. But the fix is in: experimenters have arranged that he will win one game and lose the other (and, to avoid suffering harm, will win a third and final game at the experiment's end). After winning and after losing, he, like the other boys and girls in this 2015 study conducted by psychologist Gil Diesendruck of Bar-Ilan University in Israel and his colleague, is asked by an adult whether he would be willing to lend this favorite thing to another child for one night.