CREATE TABLE table_18042 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" FLOAT, "U.S. viewers  ( millions ) " TEXT)

How many U.S. viewers, in millions, watched the episode that aired on November 13, 2007?
SELECT "U.S. viewers (millions)" FROM table_18042 WHERE "Original air date" = 'November 13, 2007'
SELECT "U.S. viewers (millions)" FROM "table_18042" WHERE "Original air date" = 'November 13, 2007'