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.

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.

Using new research, first-hand accounts and unpublished CIA files, to uncover the signs, clues and missteps that led to a Presidential assassination that rocked the world.

Newly uncovered records reveal why the seemingly reliable plane was headed toward disaster and what could have been done to prevent it.

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.