user: Question: What is the title when 18.58 u.s. viewers  (millions) watched?
Columns: ['Series #', 'Season #', 'Title', 'Directed by', 'Written by', 'Original air date', 'U.S. viewers (millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [71.0, 1.0, '" Now You Know "', 'Larry Shaw', 'Marc Cherry', 'September30,2007', '19.32']
SQL:

assistant: SELECT "Title" FROM "Table" WHERE "U.S. viewers (millions)" = '18.58';