A university student walks past an emergency call box, which is part of the campus alert system in Rice University, Texas, the United States, on July 22, 2017. The United States has some of the best colleges and universities in the world, but staying safe and avoiding being a victim of crime can sometimes be challenging. Rice University in Houston in the state of Texas has a system in place where students can call police from emergency call boxes throughout the sprawling campus of more than 6,600 students. (Xinhua/Liu Liwei)
