Two years ago, when the Minnesota Legislature passed the conceal-and-carry handgun law, businesses and organizations hurried to protect themselves by putting up those blasted signs by their main entrances: "This business bans guns in these premises." A new study shows those signs have a negative emotional effect on whomever passes by — employees and customers alike. Stephen Morgan, Ph.D., an associate professor of psychology at Concordia University-St. Paul, said... (GunPolicy.org)