Once installed, the app slowly adds a soft red filter over your display as the hours drag on. In the morning, your phone or tablet's screen will be bright white, but the app filters out the blues over time to try and reduce your exposure to the kind of bright, harsh light that keeps you awake at night and prevents you from falling into a deep sleep. The intensity of the red filter adjusts automatically, and is based on the sunset and sunrise times where you live. We tried the app out, and it works as advertised, although it takes a little getting used to at first.

 If you talk to people in the black urban underclass, they’ll tell you, “Why don’t they go find the killers? They never catch the guys who did it.” The national conversation is about over policing. But many black people in ghettos say they want more policing. It was the same in the Jim Crow south. Yes, the police could be brutal. But they would also say, “We need more protection than we’re getting.”