Young Nathan (Asa Butterfield) has issues interacting with people.  Diagnosed as on the autistic spectrum (with a little bit of synesthesia), Nathan much prefers patterns and numbers – making him a wiz at mathematics.  He shared a special connection with his father, but after dad perished in a vehicular collision, Nathan withdrew even further, and burrowed deeper into mathematics.  His mother (Sally Hawkins), unable to connect with her son, signed him up for personal advanced…