CREATE TABLE table_72140 ("No. in season" FLOAT, "No. in series" FLOAT, "Title" TEXT, "Canadian airdate" TEXT, "US airdate" TEXT, "Production code" FLOAT)

The U.S. airdate of 8 august 2008 also had canadian airdates of what?
SELECT "Canadian airdate" FROM table_72140 WHERE "US airdate" = '8 August 2008'
SELECT "Canadian airdate" FROM "table_72140" WHERE "US airdate" = '8 August 2008'