Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more . CNN  —  The sun was setting on a busy London street on a May evening in 1337 when a group of men approached a priest named John Forde. They surrounded him in front of a church near Old St. Paul’s Cathedral, stabbed him in the neck and stomach, and then fled. Witnesses identified his killers, but just one assailant went to prison. And the woman who