It’s a universal phenomenon, unavoidable on a planet of 7 billion people. You meet someone, you talk briefly, and there’s a spark—not necessarily a romantic one. Just a sudden awareness of connection, like the raw ends of two wires in your brain have just been put together and oh hey, this could mean something. Electricity flows from your smile to the hollow in your chest where the potential energy coils in a heady blend of hope and anxiety. Yes, this could be something.