An aide of science fiction writer Arthur C. Clarke said late Tuesday evening that the author has died. Rohan De Silva said Clarke died early Wednesday after suffering from breathing problems. He was 90-years-old. Clarke is the author of more than 100 books, including the short story "The Sentinel," on which filmmaker Stanley Kubrick's "2001: A Space Odyssey" was based. He was one of the most esteemed authors in the genre.