CREATE TABLE table_16282 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "U.S. viewers  ( millions ) " TEXT)

When did the no. 23 show originally air?
SELECT "Original air date" FROM table_16282 WHERE "No. in season" = '23'
SELECT "Original air date" FROM "table_16282" WHERE "No. in season" = '23'