Comment on 21 of the world's 30 cities with the worst air pollution are in India

For some who see a therapist, just talking things through isn't enough. Drama therapy allows the patient to relive a moment or play out their biggest fears.

Sen. Mark Kelly joins The Lead

This year, 28,000 pounds of human waste was removed from base camp. The Mount Everest Biogas Project plans to convert this waste into a usable product.

CNN's Victor Blackwell talks to Jazmin Evans who was kept off the transplant list for years.

Jonathan Haidt, social psychologist and author of "The Anxious Generation", explains the dangers of exposing children and teens to smartphones and social media before a certain age and offers tips for parents on how to handle these challenges.

Every year 40 athletes are chosen to race in The Barkley Marathons, and in the last three decades, only 15 people have successfully crossed the finish line