CREATE TABLE "table1_1130632_1" (
  "no_in_series" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "featured_character_s" text,
  "original_air_date" text,
  "u_s_viewers_million" text
);

Question: What are the title that have 19.48 million u.s. viewers?
SQL: SELECT "title" FROM "table1_1130632_1" WHERE "u_s_viewers_million"='19.48';

Question: Which titles have 18.73 u.s. viewers.
SQL: SELECT "title" FROM "table1_1130632_1" WHERE "u_s_viewers_million"='18.73';

Question: Who wrote all the shows with 18.73 u.s. viewers?
SQL: SELECT "written_by" FROM "table1_1130632_1" WHERE "u_s_viewers_million"='18.73';