NBC’s Brian Williams has apologized for fabricating an experience he had reporting in Iraq 12 years ago. For years, he said his helicopter was hit by enemy fire, but admitted this week that it wasn’t. Williams claims his memories got “bungled,” and he made a mistake. And in fact, science says our memories are more suggestible and less reliable than we like to think. We hear from a researcher who specializes in how our brains mislead us.