How many entries are there for date of situation for #4?
CREATE TABLE "table1_14570857_1" (
  "num" real,
  "episode_title" text,
  "situation" text,
  "date_of_situation" text,
  "nature_of_situation" text,
  "original_u_s_airdate" text
);
SELECT COUNT("date_of_situation") FROM "table1_14570857_1" WHERE "num"=4;