Determine whether vaccines are a great achievement or a scourge on health. 3/20/2012

Brandi Brevard, a campus improvement coordinator, helps a student get to school on time. FRONTLINE is following a group of at-risk students in Houston, Texas, who are struggling to stay in school -- and the school administrators who are working against the odds to keep them there.

Thoughts on freedom - and another impending trial - from Ernie Lopez. A Texas court recently threw out his 2003 conviction of sexually assaulting 6-month-old Isis Vas, who later died, though the district attorney has chosen to try Lopez again for the crime. Joint reporting from FRONTLINE, ProPublica and NPR in "The Child Cases" raised questions about the evidence used against him.

"You hear the door open and they say, 'Lopez. You're going home.'" Ernie Lopez walks out of prison to greet family, friends and reporters after a Texas court threw out his 2003 conviction of sexually assaulting 6-month-old Isis Vas. Joint reporting from FRONTLINE, ProPublica and NPR in "The Child Cases" raised questions about the evidence used against him.

After almost a decade behind bars, Ernie Lopez arrives at his home in Texas. He briefly celebrates missed holidays before breaking down remembering Isis Vas, the 6-month-old who died in his care. Lopez's conviction of sexually assaulting Vas was recently thrown out by a Texas court. Joint reporting from FRONTLINE, ProPublica and NPR raised questions about the evidence used against him.

Japanese helicopter pilot Yoshiyuki Yamaoka describes dumping thousands of gallons of water on the crippled Fukushima Daiichi nuclear power plant, a dangerous mission he embarked on last March.

FRONTLINE continues its investigation of nuclear safety with an unprecedented account of the crisis inside the Fukushima Dai-ichi nuclear complex after a devastating earthquake and tsunami struck Japan on March 11, 2011. In "Inside Japan's Nuclear Meltdown," FRONTLINE tells the full story with exclusive eye-witness accounts from the people who were there.

When things got particularly dangerous at the Fukushima Daiichi nuclear power plant last March, controversy ensued about whether the Tokyo Electric Power Company intended to withdraw all its workers, leaving the plant unmanned. Former Prime Minister Naoto Kan describes his decision to address TEPCO employees, demanding that they stay and protect the fate plant - and the country.

From acclaimed producer-director Steve James ("Hoop Dreams") and best-selling author-turned-producer Alex Kotlowitz ("There Are No Children Here"), an unusually intimate journey into the stubborn persistence of violence in our cities.

FRONTLINE follows a group of former gang leaders trying to "interrupt" shootings and protect their communities from the violence they once committed. The film follows the inner workings of CeaseFire, an innovative program in Chicago designed to prevent shootings, including weekly meetings where the interrupters report on the simmering disputes and the senseless shootings in their neighborhoods.

Not long after Cobe began to work with Lil Mikey, who had just been released from prison, Lil Mikey found a new calling as an outreach worker for CeaseFire. Just 18 years old at the time, he was their youngest employee to date. Here, he discusses the job opportunity.

Not long after Cobe began to work with Lil Mikey, who had just been released from prison, Lil Mikey found a new calling as an outreach worker for CeaseFire. Just 18 years old at the time, he was their youngest employee to date. Here, he discusses the job opportunity.

The murder of 16-year-old honors student Derrion Albert -- who was the victim of a violent confrontation between rival gangs in September 2009 -- was captured in a cell phone video that went viral, drawing attention to the nation's youth violence problem. In this excerpt from "The Interrupters," CeaseFire's Ameena Matthews helps Derrion's mother Anjanette Albert plan his funeral and vigil.

Caprysha said she never thought she would get her high school diploma, but in January 2011, she did just that. "I might've had a lot of bumps in the road, my attitude problem, crushing everybody, but I wound up going to school, just doing what I need to do the most," Caprysha happily said upon receiving it. Ameena, who spoke at the ceremony, told the graduates, "You're no different than me."

This special educational module explores the relationship between Ameena Matthews and Caprysha Anderson, a troubled teen who is struggling with violence both as a victim and a perpetrator. Ameena faces challenges as she helps Caprysha follow the right path.

Between working for his undergraduate degree and his job as a CeaseFire interrupter, Eddie has his hands full, but when his family comes to visit, we learn more about why Eddie joined the gang life, and how he became who he is today.

"This has got to stop," Anjanette Albert, whose son Derrion was killed in September 2009 after he was pulled into a fight and severely beaten. Footage of his death captured on a cell phone helped to identify and convict five young men in his murder, but for Anjanette, the pain doesn't stop.

This special educational module introduces Ameena Matthews, former drug ring enforcer and daughter of one of Chicago's most notorious gang leaders, who uses her unique skills as a violence interrupter to de-escalate conflicts before they turn to bloodshed. Explore the role gender plays in engaging communities and changing social norms around peace and violence.

Cobe started to follow in the footsteps of his father, selling drugs and going to jail, and reflects here about how his grandmother's love helped turn his life around. "I probably have broken her heart a lot of times doing things I shouldn't be doing," he admits about his grandmother. "But she always reminds me of the good in me."

Upset after learning from police that some of the interrupters are still involved in criminal activity, program director Tio Hardiman warns that they could be ruining the program for everyone else. "I'm not saying this job is everything," he cautions, "but this job does mean a lot to some people."