to reduce access to alcohol, illegal drugs and guns. Also, given significant neighbourhood effects on youth violence, interventions involving relocating families to less poor environments have shown promising results. Similarly, urban renewal projects such as business improvement districts have shown a reduction in youth violence. Different types of youth on youth violence include witnessing or being involved in physical, emotional and sexual abuse (e.g. physical attacks, bullying, rape), and violent acts like gang shootings and robberies. According to researchers in 2018, "More than half of children and adolescents living in cities have experienced some form of community violence." The violence "can also all take place under one roof, or in a given community or neighborhood and can happen at the same time or at different stages of life." Youth violence has immediate and long term adverse impact whether the individual was the recipient of the violence or a witness to it. Youth violence impacts individuals, their families, and society. Victims can have lifelong injuries which means ongoing doctor and hospital visits, the cost of which quickly add up. Since the victims of youth-on-youth violence may not be able to attend school or work because of their physical and/or mental injuries, it is often up to their family members to take care of them, including paying their daily living expenses and medical bills. Their caretakers may have to give up their jobs or work reduced hours to provide help to the victim of violence. This causes a further burden on society because the victim and maybe even their caretakers have to obtain government assistance to help pay their bills. Recent research has found that psychological trauma during childhood can change a child's brain. "Trauma is known to physically affect the brain and the body which causes anxiety, rage, and the ability to concentrate. They can also have problems remembering, trusting, and forming relationships." Since the brain becomes used to violence it may stay continually in an alert state (similar to being stuck in the fight or flight mode). "Researchers claim that the youth who are exposed to violence may have emotional, social, and cognitive problems. They may have trouble controlling emotions, paying attention in school, withdraw from friends, or show signs of post-traumatic stress disorder". It is important for youth exposed to violence to understand how their bodies may react so they can take positive steps to counteract any possible short-