Face Recognition and a general information test

This photo was sent on my email today. The sender asked me to recognize the characters in the photo. He said that if I could recognize 45 characters, then I'm very intellectual; 35 a good intellectual; 25 not so bad; 15 need to know more etc. I found it a nice challenge and thanks God I managed to cross the 45 limit. So, why don't you give it a try?

P.S. Right-click on the picture and choose open in a new tap or window, to get a better, enlarged view of the picture.