CREATE TABLE table_30221 ("Series #" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT, "U.S. viewers  ( million ) " TEXT)

Who wrote the episode that 2.93 million viewers?
SELECT "Written by" FROM table_30221 WHERE "U.S. viewers (million)" = '2.93'
SELECT "Written by" FROM "table_30221" WHERE "U.S. viewers (million)" = '2.93'