Lunch at the West Salem School District in Wisconsin. Michelle Kloser/ for NPR hide caption

itoggle caption Michelle Kloser/ for NPR

Ronald Heifetz draws on his training as a psychiatrist to coach aspiring leaders at Harvard's John F. Kennedy School of Government. Ben de la Cruz/NPR hide caption

itoggle caption Ben de la Cruz/NPR

Kids might be more satisfied if they get one good treat instead of one good treat and one lesser treat. iStockphoto.com hide caption

itoggle caption iStockphoto.com