Leif Kaldor

One of the great mysteries of history is how the ancient Maya built such an incredible society in a tropical rainforest over two thousand years - and then vanished. How? Why? New discoveries and new science can now tell the story.

A half a billion dollar project, a crushing architectural challenge and impossible deadline, two warring political titans and an architect who has never built anything. What could go wrong?

Brendan is a pastor in a small, evangelical church, and he has a secret. He doesn't believe in God anymore. His wife is still a true believer - and she just told the wrong person. Losing Our Religion is a feature length documentary about preachers who are not believers, and what atheists do when they miss church. Allowed access to the 600 members of The Clergy Project - a safe haven for preachers from all faiths who no longer believe - the documentary follows ex-members and clergy who are still undercover. They are not just losing their religion, for many they are losing their friends, community and even family. As well as their job. As events unfold that change lives forever, their stories also connect with secular communities that are growing in surprising places. New groups are experimenting in ways to have church without god, and asking the same question as unbelieving clergy - "what's next?"

Uncover the lost secrets of a once-mighty empire. The city of Angkor, the seat of the great Khmer Empire in Southeast Asia for 500 years, was once the biggest city in the world. For centuries, this incredible civilization flourished, building the largest religious monument on Earth, Angkor Wat, and mastering urban engineering in a challenging landscape. But then it was mysteriously abandoned, swallowed by the jungle. Now, cutting-edge technology and new discoveries are finally revealing how this astounding empire rose to global prominence – and what likely led to its devastating collapse.

There's a new revolution happening overhead. The drones are coming. The question is: who gets to use them, and how?

The ancient ancestors of today’s Maya people thrived in large sophisticated cities across Central America for centuries. Why, around 750 CE, did they begin to abandon many of their major cities? Archaeologists investigate dramatic new evidence of the catastrophic droughts and instability that pushed cities beyond their limits.

Something in the Air is a one hour documentary that shows new risks in the most essential element for survival – air – that affect our brains, our DNA, and how new technology is changing the equation for the better.

PBS' premier science series helps viewers of all ages explore the science behind the headlines. Along the way, NOVA demystifies science and technology, and highlights the people involved in scientific pursuits.