CREATE TABLE table_65378 ("Nation" TEXT, "Birth date" TEXT, "Height  ( m ) " TEXT, "Weight  ( kg ) " TEXT, "World Rank" TEXT)

what is the nation when the world rank is 2 and the birth date is 1976-12-20?
SELECT "Nation" FROM table_65378 WHERE "World Rank" = '2' AND "Birth date" = '1976-12-20'
SELECT "Nation" FROM "table_65378" WHERE "Birth date" = '1976-12-20' AND "World Rank" = '2'