Synopsis

Lesley Stahl investigates the management of a staggering 100 million tons of coal ash waste by the country's largest energy provider in North Carolina. Sanjay Gupta profiles billionaire surgeon Patrick Soon-Shiong, who shares his perspectives on innovative approaches to cancer treatment. Bill Whitaker journeys to Cremona, Italy, to meet artisans who continue to craft violins using methods perfected by Antonio Stradivari centuries ago.