Experts say that because of how memory works, it's possible that both Supreme Court nominee Brett Kavanaugh and Christine Blasey Ford - the woman who says a drunken Kavanaugh pinned her to a bed and groped her at a party when they were teenagers in the early 1980s - believe what they say. "Confidence is not a good guide to whether or not someone is telling the truth," said Nora Newcombe, a psychology professor at Temple University in Philadelphia.