Russell Crowe didn’t want to meet John Nash, the seminal mathematician he would play in Ron Howard’s eventual Best Picture-winning biopic A Beautiful Mind, released in theaters 20 years ago today. As the New Zealand-born, Australia-raised actor explained around the time of release, he didn’t want to spend too much with Nash — then in his 70s — because he felt the 35 years Nash spent on meds for the paranoid schizophrenia he suffered from had made him a different person than the younger versio...