Our world is changing. Temperatures are climbing. Ocean levels are rising. Giant storms are becoming more frequent and intense. Super-viruses are thriving in this new environment. At the same time, ...

They're our first line of defense in the darkest of times. And they're often the first responders to threats from another world. Over the past 70 years the world's military forces have come face to ...

In April 2011 the FBI declassified decades' worth of secret government documents that contain thousands of reports of UFO sightings and alien activity. Each episode of this half-hour series tackles ...