Today, I went to a lecture by Peter Sarnak, a famous mathematician who currently teaches in Princeton University. Mr.Sarnak came to Stanford tonight to give a lecture on the sum of the squares and number theory. Unfortunately, I can not tell you much about it because I didn’t understand what he was talking about from the first topic. I could not follow along; it was too hard for me. I eventually slept in the middle! Yup, you heard it slept!