Even before the horrific shooting in Newtown, this was a year in which guns were in the news. There was the mass shooting in Aurora, Colorado. And another story we've followed began in February with a 911 call in Sanford, Florida.
(SOUNDBITE OF 911 CALL)
GEORGE ZIMMERMAN: This guy looks like he's up to no good, or he's on drugs or something. It's raining and he's just walking around looking about.
UNIDENTIFIED MAN: OK. And this guy, is he white, black or Hispanic?
The writer Ta-Nehisi Coates says he noticed something about one of this year's major news stories. When Trayvon Martin, a black teenager, was killed by a white man in Florida, there was widespread dismay. And then President Obama spoke.