Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more . CNN  —  A rare knife handle in the shape of a gladiator has been discovered at Hadrian’s Wall in the north of England, shining a new light on the celebrity status of the ancient Roman combatants. The copper alloy knife handle depicts a class of gladiator known as a “secutor,” according to conservation charity English Heritage, which cares for the