An old problem is getting new attention in the United States--bullying.Recent cases included the tragic case of a fifteen-year-old girl whose family moved from Ireland.She hanged herself in Massachusetts in January following months of bullying.Her parents criticized her school for failing to protect her.Officials have brought criminal charges against several teenagers. Judy Kaczynski is president of an anti-bullying group called Bully Police USA.Her daughter Tina was the victim of severe bullying starting in middle school in the state of Minnesota.She said, "Our daughter was a very outgoing child.She was a bubbly personality, very involved in all kinds of things, had lots of friends.And over a period of time her grades fell completely.She started having health issues.She couldn't sleep.She wasn't eating.She had terrible stomach pains.She started clenching her jaw and grinding her teeth at night.She didn't want to go to school." Bullying is defined as negative behavior repeated over time against the same person. It can involve physical violence.Or it can be verbal -- for example, insults or threats.Spreading lies about someone or excluding a person from a group is known as social or relational bullying. And now there is cyberbullying, which uses the Internet, e-mail or text messages.It has easy appeal for the bully because it does not involve face-to-face contact and it can be done at any time. The first serious research studies into bullying were done in Norway in the late 1970s.The latest government study in the United States was released last year.It found that about one-third of students age twelve to eighteen were bullied at school. Susan Sweater is a psychologist at the University of Nebraska-Lincoln and co-director of the Bullying Research Network.She says schools should treat bullying as a mental health problem to get bullies and victims the help they need.She says bullying is connected to depression, anxiety and anti-social behavior, and bullies are often victims themselves. From the case of Tina, we can know that  _  .
bullying is rare victims suffered a lot schools are to blame personalities are related