Recent mass shootings have revived demands for meaningful gun control. But many opponents of a renewed federal ban on assault weapons, led by the National Rifle Association, say the earlier ban, from 1994 to 2004, made no difference. Our new research shows otherwise. We found that public mass shootings — which we defined as incidents in which a gunman killed at least six people in public — dropped during the decade of the federal ban. Yet, in the 15 years since the... (GunPolicy.org)