What is the original air date of # 6?
CREATE TABLE "table1_27547668_2" (
  "num" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "viewers" real,
  "original_airdate" text,
  "prod_code" real
);
SELECT "original_airdate" FROM "table1_27547668_2" WHERE "num"=6;