There’s a brief scene somewhere in Cameraperson where a wild-eyed, bespectacled astrophysicist explains quantum entanglements. The basics of it are fairly simple: consider two linked particles; now move one far away. Experiments performed on the nearby particle can and will eventually be felt by the distant other — it’ll just take light years for the effects to reach it. We know the particles are entangled, in space and time, but the mystery — to astrophysicists and us — is understanding why and how this happens the way it does.