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Insufficient planning, defiant tourists and months of ignored warnings lead to chaos in May 1980 when Washington's Mt. St. Helens devastates the surrounding area with a lateral eruption.
In 2013, a devastating explosion rocked the Boston Marathon, and experts suggest a lack of security and surveillance allowed two brothers to carry out the terror attack undetected.
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.