What's the title of the episode written by David Simon? 
CREATE TABLE "table1_13755296_1" (
  "series_num" real,
  "season_num" real,
  "title" text,
  "story_by" text,
  "teleplay_by" text,
  "directed_by" text,
  "original_air_date" text
);
SELECT "title" FROM "table1_13755296_1" WHERE "teleplay_by"='David Simon';