General people might think it is safer in company of many other than of small number of people. They reason that if there are many people around them, many people would help them when they are in dangerous or emergency situations. However, it turns out that it might be more dangerous in many people than in small number of people. Bystander nonintervention or bystander effect is social psychological phenomenon that occurs when people do not offer any means of help in an emergency situation to the victim when other, especially many, people are present. Two famous cases clearly represent bystander nonintervention and show that being in many numbers can be more dangerous than being in few numbers. On March 13, 1964 28-year-old Catherine Genovese was stabbed near her apartment in New York City. She was screaming and crying for help for about 30 minutes in front of her apartment, no one tried to help her and even did not bother to call the police. According to neighbors, more than 30 of her neighbors heard the scream. On October 23, 2009, a 16-year-old girl was raped by group of people when about 20 bystanders stood and watched. Surprisingly, no one helped her and even called the police even though many of them have cellphones. Darley and Latane suggested that two main factors explain bystander nonintervention. The first is pluralistic ignorance, which means that people cannot recognize the situation as an emergency because they assume that nobody is responding to the situation. The second is diffusion of responsibility, which means that people feel less responsible when more people are present in the situation. The presence of many other individuals makes them think that other people also can help if they don't help victims. However, I think that it would be safer in many numbers if people in dangerous situation know effective ways to ask for help. First, it is important to let other people know that he or she is in dangerous situation and needs immediate help. Second, one of effective ways to ask for help is to point out directly to nearby bystander and ask for help. It makes not only the pointed bystander recognize the situation but also feel more responsible to help.