Awesome Hard Science novel. 4.5 stars 
 Mark Watney is an astronaut and part of a NASA mission to Mars. He and the rest of the crew were supposed to stay just over month and do research on the surface. Due to a sandstorm the mission is aborted. However during the storm, Mark is hit by flying debris and his suit is punctured. Presumed dead the rest of the crew takes off to save their own lives. But against all odds Mark is still alive. But now he has to survive on Mars, in a habitat build to last 30 day, only so much ration, and the risk of death when any one of a dozen critical systems fails. 
 This was a truly awesome novel. This felt like it could really happen, the math works, the technology works and the characters work. Sprinkled with a good dose of humour this is a mustread for any Hard Science and NASA fans. 
 A Hard-Science mustread!