Watch The Aftermath

The 2000 film "Erin Brockovich" seemed like a successful David versus Goliath story. A single mom of three took on PG&E for contaminating drinking water in Hinkley, California, and came out victorious, suing and winning $333 million from the giant utility company. But whatever became of the tiny town?

In the early hours of 2009, 22-year-old Oscar Grant was fatally shot by a Bay Area Rapid Transit police officer at the Fruitvale station in Oakland, California. The shooting was captured on cellphone, made headlines nationwide, and led to a national conversation about police brutality. As more police killings made news, Grant's mother, Wanda Johnson, decided to turn her grief into a purpose.

Heather Martin was a senior at Columbine High School in Colorado when two teenagers shot and killed 12 students and one teacher. More than a decade later, 12 people were killed and dozens more injured in a shooting at an Aurora movie theater, just miles from where Martin lived. Martin co-founded The Rebels Project, to help survivors process their experiences.