David Brin’s list of “Greatest Science Fiction and Fantasy Tales” is actually a series of 14 lists divided into such categories as “Dire Warnings and Self Preventing Prophecies,” “Harbingers of Hope,” “Alternative History/Parallel Worlds,” “Huh! I Never Realized!” and “Sheer Beauty.” Also available on the page are links to his essays on “The Difference Between Science Fiction and Fantasy” and “How to Define Science Fiction.”