CREATE TABLE "table1_23958944_5" (
  "no_by_series" real,
  "no_by_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_number" real,
  "u_s_viewers_in_millions" text
);

Question: Who directed episode 21?
SQL: SELECT "directed_by" FROM "table1_23958944_5" WHERE "no_by_season"=21;

Question: What is the series number of the episode "Pandora"?
SQL: SELECT "no_by_series" FROM "table1_23958944_5" WHERE "title"='\"Pandora\"';

Question: What episode was watched by 10.81 million US viewers?
SQL: SELECT MIN("no_by_season") FROM "table1_23958944_5" WHERE "u_s_viewers_in_millions"='10.81';

Question: How many episodes are titled "Cops & Robbers"?
SQL: SELECT COUNT("no_by_season") FROM "table1_23958944_5" WHERE "title"='\"Cops & Robbers\"';

Question: What episode is directed by Bryan Spicer and written by Terence Paul Winter?
SQL: SELECT "title" FROM "table1_23958944_5" WHERE "directed_by"='Bryan Spicer' AND "written_by"='Terence Paul Winter';