OK Let’s Do The Math ! – Martian the Movie tries to remain faithful to scientific principles

In order to ‘Science the *&#^ out of this’ it is necessary to do some math.
What do you do when everything goes south on you?

Learn more about the accuracy of the science that was used to help tell a story about the drive to communicate.
http://www.theguardian.com/film/2015/oct/06/how-scientifically-accurate-is-the-martian