Adam Lanza stayed at home mostly, a witness said, playing video games such as "Call of Duty." But on December 14, 2012, he went out -- armed with 10 30-round magazines for his semiautomatic Bushmaster .223 caliber model XM15 rifle and bullets for his two handguns and a shotgun. Lanza didn't make it home alive. Nor did the 26 people -- 20 of them schoolchildren ages 6 and 7 -- he shot dead in less than five minutes, firing one bullet roughly every two seconds he was at Sandy Hook Elementary School. These were among the details spelled out Thursday...