CREATE TABLE table_21730 ("Series #" FLOAT, "Episode #" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "U.S. viewers  ( million ) " CLOB, "Original airdate" CLOB, "Production Code" CLOB)

Who wrote episode 11?
SELECT "Written by" FROM table_21730 WHERE "Episode #" = '11'
SELECT "Written by" FROM "table_21730" WHERE "Episode #" = '11'