Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_16494599_10 ( nationality VARCHAR, school_club_team VARCHAR )

### Question ###
What are the nationalities of players who attended duke?

### Accurate SQL ###

SELECT COUNT(nationality) FROM table_16494599_10 WHERE school_club_team = "Duke"