Who is your favorite author?
Isaac Asimov. But I like all the classic authors. 
Yeah - how about George Orwell and 1984
That is a classic novel.  Any idea who the best selling sci fi author of all time is?
Hmm - good question. Frank Herbert? Depending on what you include as sci fi. Do you think Harry Potter is sci fi?
I'd say Harry Potter is more fantasy, but still good. What do you think of Author C. Clark?
Great writer. His Odyssey series is sooo good. Did you enjoy the movie 2001
Yes. I liked the 2001 movie, but didn't really like the sequels as well. I think I liked his Rama series best of all.
So who is the better - Ray Bradbury or Robert Heinlein
That is a difficult choice, but I think I would go for Heinlein. Which of his books do you think is best?