If violence spreads like a disease, it can be interrupted. How a new team in Milwaukee is trying to stop one shooting leading to another.

Colombia has attempted to decrease murder and homicide rates by setting up curfews for teenagers, forcing bars to close earlier in the evening, and creating gun laws to prevent the carrying of weapons. As a result of this epidemiological, data-driven approach, along with other governmental factors, the homicide rate has decreased significantly in most of the cities in which it was implemented.

At St. John Hospital in Detroit, the principles of cultural sensitivity and collaboration—as well as lots of fundraising—have boosted previously low breastfeeding rates by black mothers.

Citizens in Cairo have been working to make the streets cleaner in an effort to create more pride for the country and get the government's attention. From picking up trash and painting lampposts to collecting donations from passersby, the community is working together to make a new Egypt.

Different programs in various nations are training ordinary people and creating community groups to effectively satisfy the mental health needs of their communities. In many of these regions, "treatment gaps" – where there are little to no mental health treatment plans or resources – exist, but this new informal infrastructure helps to fill that.

Richmond, California ranked among the highest homicide rates in the country. The city created the Office of Neighborhood Safety to engage the community in the effort to curb gun violence and prevent homicides. ONS works directly with the young people who are at risk and have succeeded in reducing the homicide rate.

Global social and economic problems are difficult to change. However, fan-activism fuels the interests of fans of popular young adult fiction. Books such as Harry Potter and the Hunger Games have inspired activist groups that raise awareness of global hunger, reading, and relief supplies to impoverished nations, among others. Being a fan has served as a bridge to become politically active and solve the world’s problems.

Teenagers around the world are at risk of indoctrination by Islamic extremism and volunteering to fight for the Islamic state. Different European nations seek to make Islamic extremism unattractive to youth by bolstering surveillance efforts, internet outreach, and teaching the Islam of peace.

A program in Philadelphia is pioneering new ways to treat the urban wounded. By seeing it as PTSD, and not pointing fingers, the city is using mental health tools to decrease violence and heal communities.

The best way to lose weight is to join a small group. This article looks at the case study of Saddleback Church in southern California that mixed faith and peer support to help congregates lose weight, including the pastor. Surveys found that 72% of participants lost weight as a result of the program.

While weight loss can be challenging to maintain, different structures are being created to help. Certain support groups, financial incentives, and tough love are proving to be effective.