I found it interesting that Staten Island is so much less diverse than the other boroughs.  Being from Staten Island, I assumed it was somewhat closer in the amount of diversity it contains to the other parts of New York City.  Comparing my grammar school and high school experiences to college, I do see less diversity in Staten Island than in Manhattan although it may be increasing.

I also found it interesting that the boroughs of New York City are so diverse on their own (with Staten Island as the exception).  Manhattan, Brooklyn, Queens, and the Bronx surpassed many other major cities in the level of diversity they had.  This remains true even when there are many people moving out of the city because there are also new people coming in.