CREATE TABLE table_2901 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "U.S. viewers  ( millions ) " CLOB)

Who wrote the episode seen by 10.64 million people in the US?
SELECT "Written by" FROM table_2901 WHERE "U.S. viewers (millions)" = '10.64'
SELECT "Written by" FROM "table_2901" WHERE "U.S. viewers (millions)" = '10.64'