10 Things You Need To Know For Wednesday

Adam Lanza's mother was among the tens of millions of U.S. gun owners. She legally had a .223-caliber Bushmaster rifle and a pair of handguns, which her 20-year-old son used to kill 20 children and six adults in 10 minutes inside a Connecticut school. In the raw aftermath of the second-worst school shooting in U.S. history, countless gun enthusiasts much like Lanza's mother complicate a gun-owning narrative. More civilians are armed in the U.S. than anywhere else in the world, with Yemen coming in a distant second, according to the independent Small Arms Survey in Geneva.

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News in Photos: The 10 topics you should be ready to talk about today.