2 PSA's Brought To you by Sarena,Seamus,Laura, and Dakota Posted by Sarena Shuman in Physics - Echols on Saturday, March 9, 2013 at 10:50 am Here are two PSA's, we constructed to share the rules of the roads. We need to reduce accidents and save lives. But we need physics help and yours in order to do it. Comments No comments have been posted yet. Log in to post a comment.