Arthur C. Clarke, noted scientist and lauded science fiction author, died Wednesday (Tuesday EST) at his home in Sri Lanka at the age of 90. Clarke, a respected scientist who worked on the development of radar as a young man and proposed the idea of geostationary telecommunications satellites, was most famous for his science fiction stories and novels. He shared an Academy Award with Stanley Kubrick for Best Adapted Screenplay for "2001: A Space Odyssey," still considered one of the cornerstones of science fiction in both print and cinema.