Photo by Susan Catherine via the LAist Featured Photos pool on Flickr Best known for his authoring of "2001: A Space Odyssey," sci-fi writer Arthur C. Clarke has died at 90 in Sri Lanka. This just in from the LA Times's Soundboard blog...Prince has been added to the Coachella roster! Nice! Obama had a huge campaign moment this morning, perhaps the biggest yet: he confronted the race issue in a stirring speech after his......