This is no magician’s act. British start-up Invisibility Shield Co. has revealed that it has created a 6-foot-tall “Megashield” being sold for $828 — which they claim can make multiple people ...

There’s a well-known story in Plato’s Republic in which a humble shepherd named Gyges finds a magical gold ring that renders whoever wears it invisible. Gyges proceeds to use his newfound power to ...