Why Do We Lies?

CNN's John Sutter looks at a study that found 60% of people lied in 10-minute conversations. Women were more likely to lie to make the person they were talking to feel good while men lied most often to make themselves look better, he says. He asks: At what age does lying start? Is there a period where a child is capable of talking and doesn't lie or does the lying start as soon as they can talk?