CREATE TABLE "table1_13301516_1" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" real,
  "u_s_viewers_millions" text
);

Question: Which episode was watched by 11.75 million U.S. viewers?
SQL: SELECT "title" FROM "table1_13301516_1" WHERE "u_s_viewers_millions"='11.75';

Question: How many U.S. viewers, in millions, watched the episode that aired on November 13, 2007?
SQL: SELECT "u_s_viewers_millions" FROM "table1_13301516_1" WHERE "original_air_date"='November 13, 2007';

Question: How many episodes originally aired on April 29, 2008?
SQL: SELECT COUNT("no_in_series") FROM "table1_13301516_1" WHERE "original_air_date"='April 29, 2008';

Question: How many millions of U.S. viewers watched episode 185?
SQL: SELECT "u_s_viewers_millions" FROM "table1_13301516_1" WHERE "no_in_series"=185;

Question: Who directed the episode that originally aired on January 15, 2008?
SQL: SELECT "directed_by" FROM "table1_13301516_1" WHERE "original_air_date"='January 15, 2008';