Medicine: Zombies: Do They Exist?

Yes, says a Harvard scientist, who offers an explanation

On a brilliant day in the spring of 1980, a stranger arrived at L'Estère marketplace in Haiti's fertile Artibonite Valley. The man's gait was heavy, his eyes vacant. The peasants watched fearfully as he approached a local woman named Angelina Narcisse. She listened as he introduced himself, then screamed in horror—and recognition. The man had given the boyhood nickname of her deceased brother Clairvius Narcisse, a name that was known only to family members and had not been used since his funeral in 1962.

This incident and four others in recent years have sparked...