Two inventors -- one in France, one in Australia -- design pollution-free vehicles that run on compressed air. Detroit, are you listening? View

The tiny mountain pine beetle is destroying millions of acres of forests. It's the largest insect infestation in the history of North America. View

In northern British Columbia, a self-trained biologist is battling fish farms in hopes of saving the orca whale population. View

The issue of global warming is captured in a video created entirely by using 20,000 still images taken over 20 days. View

Ray Farkas whimsically turns the camera on himself during brain surgery for Parkinson's disease, and narrates his own operation. View

Parents tell the story of struggling to care for, and trying to understand, their children who suffer from a rare and complex genetic disorder, CFC. View

What goes on inside the head of savant Daniel Tammet, who can calculate Pi to 22,500 digits and learn a language in a week? View

Investigative series about tens of thousands of nuclear arms workers who unsuccessfully applied for compensation for severe job-related illnesses. View

After serving nearly half his life in jail for a rape he did not commit, Dwayne Dail describes his 18-year imprisonment and, thanks to new DNA evidence, recent release. View

A Pulitzer Prize-winning five-part series on the crisis in the seas, caused by toxins, debris, acidity, bacteria and sewage. View

The lack of DNA evidence that might clear him leaves a young murderer behind bars, leaving many to wonder if he's wrongfully convicted. View