Did you know Harrison Ford – the actor behind Han Solo and Indiana Jones – had a Jewish grandfather? You probably did. You probably also know that Mila Kunis, Seth Rogen, and Steven Spielberg are Jewish. For many of us, discovering another “member of the tribe” on Wikipedia has become a kind of communal ritual, as familiar as attending synagogue or a youth movement.That small thrill of recognition, of seeing a familiar name, a shared origin, is more than gossip. It's a flash of belonging. A