CREATE TABLE "table1_23483182_1" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "u_s_viewers_million" text,
  "original_air_date" text,
  "production_code" real
);

Question: Who directed 414?
SQL: SELECT "directed_by" FROM "table1_23483182_1" WHERE "production_code"=414;

Question: What is the series number of the episode that aired March 25, 2010?
SQL: SELECT MIN("no_in_series") FROM "table1_23483182_1" WHERE "original_air_date"='March 25, 2010';

Question: Who wrote the episode that aired February 4, 2010?
SQL: SELECT "written_by" FROM "table1_23483182_1" WHERE "original_air_date"='February 4, 2010';

Question: What was the air date where there were 5.72 million viewers?
SQL: SELECT "original_air_date" FROM "table1_23483182_1" WHERE "u_s_viewers_million"='5.72';

Question: What number was there 6.01 million u.s. drivers?
SQL: SELECT "no_in_season" FROM "table1_23483182_1" WHERE "u_s_viewers_million"='6.01';