True in some senses, but take 'Interstellar' for instance. I would personally categorize it as hard science pushing the fringe into fantasy/speculation. 'The Ma

True in some senses, but take 'Interstellar' for instance. I would personally categorize it as hard science pushing the fringe into fantasy/speculation. 'The Martian' I would consider more hard science fiction overlooking some technical issues for dramatic effect. In any case, I enjoy SF that is mainly in the realm of hard SF. I read John Cramer's 'Twistor' years ago, and although some have panned it for some stereotypes, I loved reading it at the time. I'll have to revisit it. Professor Cramer is a physics professor at Univ. of Washington in Seattle.