CREATE TABLE table_29687 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "U.S. viewers  ( millions ) " TEXT, "Original U.S. air date" TEXT, "Prod. code" TEXT)

who were the director of the episode whose number in the season is 17?
SELECT "Directed by" FROM table_29687 WHERE "No. in season" = '17'
SELECT "Directed by" FROM "table_29687" WHERE "No. in season" = '17'