You've probably heard of chemtrails theories before -- they're often derided in the mainstream. But has something like the chemtrail theory ever been proven? Have governments really poisoned unsuspecting civilians with airborne chemicals?

In 2015 alone more than 300 million people visited the US national park system. Some stayed for a few hours, others for a few days – and, occasionally, some never make it out.

The advent of social media technology has made global communication easier than ever before – yet this innovation creates opportunities for evil as well as good. Learn how ISIS is using social media to manipulate, groom and ultimately recruit people across the planet.

It's no secret that inequality is skyrocketing - but according to various international institutions, extreme poverty is also diminishing. So what's the future of poverty - and why don't some critics trust the organizations created to fight it?

Is it true that there are more slaves alive today than at any other point in human history? What's the future of slavery and human trafficking? Join Ben and Matt as they take a closer look at the face of modern slavery.

What is the Monster with 21 Faces? Who was the Somerton Man? Join the guys as they explore some of history's strangest unsolved crimes.

Antarctica is one of the most mysterious places on the planet. If the ice melted, what would we find beneath?

Could the New Madrid fault destroy the Midwest? Tune in to learn more.

From Greek fire to Roman concrete modern humans are only now beginning to rediscover the secret technology of the ancient world.

For centuries Damascus steel was legendary, and the crafting of this superb metal a closely-guarded secret. So what happened? Has anyone cracked the code on the lost techniques of forging Damascus steel?