CREATE TABLE "table1_18424435_4" (
  "no" real,
  "num" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "canadian_air_date" text,
  "u_s_air_date" text,
  "production_code" real,
  "canadian_viewers_million" text
);

Question: What was the air date in the U.S. for the episode that had 1.452 million Canadian viewers?
SQL: SELECT "u_s_air_date" FROM "table1_18424435_4" WHERE "canadian_viewers_million"='1.452';

Question: What number episode in the series was directed by Kelly Makin and written by Mark Ellis & Stephanie Morgenstern?
SQL: SELECT "no" FROM "table1_18424435_4" WHERE "directed_by"='Kelly Makin' AND "written_by"='Mark Ellis & Stephanie Morgenstern';

Question: What is the maximum number of episodes in the series listed?
SQL: SELECT MAX("no") FROM "table1_18424435_4";

Question: What is the total number of episodes listed with a production code of 306?
SQL: SELECT COUNT("num") FROM "table1_18424435_4" WHERE "production_code"=306;

Question: Who directed the episode with a production code of 301?
SQL: SELECT "directed_by" FROM "table1_18424435_4" WHERE "production_code"=301;