This is not a new movie, but this is a great movie about a Nobel Prize winner mathematician John Nash 's life. John Forbes Nash Jr. is a mathematician work on the game theory and differencial geometry. The film focus on his experiences of schizophrenia, which he has mental illness that leads him to see halucinations. He see someones which everybody else doesn't see. They talk to him, which is so real. For john, they are all real, because he see them with his own eyes, they do communicate. What if when you are talking to someone, and your friend told you, there is no one, it just your halucination, but "someone" is just standing there and so real like other else. What will you feel, you will get confused, just like John.
John was confused at first, then he start to have medication which have a great side effects that makes him can't do his work, can't make love with his wife etc. So he stop taking the med and get halucinations again. This leads him nearly make his baby drown. Fortunately, his wife was there to pull the plug. His imaginary "frens" asked him to kill his wife, said that his wife wanna ask doctor to lock him up and he will never come back home. Finally he starts to realized that his imaginary frens wasn't real ...
To read up the entire stories of this movie, go Wikipedia, but I prefer you to watch it, it is a very nice movie, although the film is not be regarded as a biography of Nash.
This is the home page of John Nash, go