NEW YORK - No one knows what led a Florida neighborhood watch captain to shoot Trayvon Martin, a teenager carrying no weapon. But a new study raises an intriguing question: Could the watch captain have been fooled into thinking the youth was armed in part because he himself was holding a gun? In the study, volunteers who held a toy gun and glimpsed fleeting images of people holding an object were biased toward thinking the object was a gun. It's another indication... (GunPolicy.org)