CREATE TABLE table_29479 ("No. in Series" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "U.S. viewers  ( millions ) " TEXT)

How many millions of U.S viewers watched the episode titled 'Mended Hearts'?
SELECT "U.S. viewers (millions)" FROM table_29479 WHERE "Title" = 'Mended Hearts'
SELECT "U.S. viewers (millions)" FROM "table_29479" WHERE "Title" = 'Mended Hearts'