Sam Kean

The price of diamonds can vary greatly depending on size, cut, color, and other factors, including whether they have a history. But because of the rarity of blue boron diamonds, they often fetch more money than gems of similar quality.

Those of us in law enforcement must redouble our efforts to resist bias and prejudice. We must better understand the people we serve and protect - by trying to know, deep in our gut, what it feels like to be a law-abiding young black man walking on the street and encountering law enforcement. We must understand how that young man may see us.