The anniversary of the shooting at Sandy Hook Elementary in Newtown, Connecticut is December 14th, and parents and friends of the victims have released a powerful two minute Public Service video in memory of the horrible event that killed 20 elementary school children, and six adults. The 'Know the Signs' campaign is meant to show how easily it is to overlook behavior that could potentially lead to a disaster. Sandy Hook Promise has posted the video to YouTube, and it has already been viewed almost six million times.