Can you ever really know those most beloved to you? Are you sure? Jad wonders how his tiny son experiences the world. Developmental psychologist Dr. Charles Fernyhough explains what science conjectures about what the world is like for a newborn...and shatters Jad's warm fuzzies. But how can Dr. Fernyhough really know that Jad is a conscious being, and not a zombie or a robot?

When your sense of knowing the other gets jumbled, it can be disorienting--even traumatic. Dr. Carol Berman and Dr. V.S. Ramachandran explain the psychology and neurology behind a haunting disorder called Capgras syndrome.