user: Question: who are the writers of the episode that had 3.07 millions of North American spectators?
Columns: ['No.', '#', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'U.S. viewers (million)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [23.0, 1.0, '" Normal Is the Watchword "', 'John Kretchmer', 'Rob Thomas', 'September28,2005', '2T7201', '3.30']
SQL:

assistant: SELECT "Written by" FROM "Table" WHERE "U.S. viewers (million)" = '3.07';