We don't have an overview of this episode, please check back later.

We don't have an overview of this episode, please check back later.

In 2011, a preventable nuclear meltdown in Japan endanger tens of thousands due to multiple structural failures, a lack of emergency training and a persistent myth of infallible safety.

In 2011, a preventable nuclear meltdown in Japan endanger tens of thousands due to multiple structural failures, a lack of emergency training and a persistent myth of infallible safety.

Physicians and other experts examine the rise of an opioid crisis fueled by greed and misleading claims made by Purdue Pharma, makers of the highly addictive painkiller OxyContin.

Physicians and other experts examine the rise of an opioid crisis fueled by greed and misleading claims made by Purdue Pharma, makers of the highly addictive painkiller OxyContin.

A list of 10 key errors and missteps that were made before, during, and after the 1980 eruption of Mount St. Helens in Washington state.

A list of 10 key errors and missteps that were made before, during, and after the 1980 eruption of Mount St. Helens in Washington state.

April 15, 2013. Two explosions rock the Boston Marathon, killing three people and injuring over 260. The blasts are immediately identified as a terrorist act, but many questions remain. Who planted the bombs? Why did they do it? And most pressing of all: how did they pull off an attack at one of America's most celebrated events undetected? Through in-depth analysis and expert testimony, we list the missed opportunities, security failures, and other errors that allowed the devastating events to unfold before, during, and after the bombing.

April 15, 2013. Two explosions rock the Boston Marathon, killing three people and injuring over 260. The blasts are immediately identified as a terrorist act, but many questions remain. Who planted the bombs? Why did they do it? And most pressing of all: how did they pull off an attack at one of America's most celebrated events undetected? Through in-depth analysis and expert testimony, we list the missed opportunities, security failures, and other errors that allowed the devastating events to unfold before, during, and after the bombing.

Iranian students invade the U.S. Embassy in Tehran, taking 66 Americans hostage and triggering a crisis that will last 444 days; 10 key mistakes the United States made, including an ignorance of anti-U.S. sentiment and multiple security errors.

Iranian students invade the U.S. Embassy in Tehran, taking 66 Americans hostage and triggering a crisis that will last 444 days; 10 key mistakes the United States made, including an ignorance of anti-U.S. sentiment and multiple security errors.

A look at ten key factors that contributed to the 2021 Texas blackout, which left four million homes without power and heat, leading to roughly 700 deaths.

A look at ten key factors that contributed to the 2021 Texas blackout, which left four million homes without power and heat, leading to roughly 700 deaths.

During the night, the Champlain Towers South condo in Surfside, Miami, collapsed, killing 98 people; revealing fatal mistakes that led to the disaster, including code violations, inadequate storm defenses, ignored warnings and a contaminant.

During the night, the Champlain Towers South condo in Surfside, Miami, collapsed, killing 98 people; revealing fatal mistakes that led to the disaster, including code violations, inadequate storm defenses, ignored warnings and a contaminant.