CREATE TABLE table_29319 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT, "U.S. viewers  ( million ) " TEXT)

What original air date has 5.85 u.s. viewers (million)?
SELECT "Original air date" FROM table_29319 WHERE "U.S. viewers (million)" = '5.85'
SELECT "Original air date" FROM "table_29319" WHERE "U.S. viewers (million)" = '5.85'