Can I Hear the Voices of the Dead?

Humans have long been fascinated by the idea that they could somehow speak with the dead. Most of us feel connected to them in one way or another, and we often ache for the chance to reunite. There are grieved lovers who want another chance to say goodbye; students who seek advice from deceased mentors; family members who yearn to make amends for past wrongs. Whatever our reasons, this craving for a continued relationship with our predecessors seems to be built into our DNA.

More than once, I’...