Season 53

What if asteroids, long feared as destroyers of life, were key to our existence? Explore a revolutionary theory that these violent collisions provided the essential ingredients – water, minerals, and energy – needed to jumpstart life on Earth.

Deep in the Cambodian jungle lie the ruins of Angkor, a marvel of urban engineering and seat of the once-mighty Khmer Empire. New discoveries are revealing how this ancient metropolis was built – and what likely led to its devastating collapse.

Can dogs understand what we say—and talk back? Witness amazing moments from a major experiment, as thousands of dogs use speech buttons. Pet owners are convinced, but are our furry friends really communicating their thoughts and desires with us?

The surprising story of mammal evolution begins long before the age of dinosaurs. Witness how some of our prehistoric mammal relatives survived global catastrophes, defying extinction and evolving into the vast array of mammals we know today – including us.

Surprising evidence at the world's oldest temple overturns our understanding of human history. The latest excavations at the 12,000 year-old Göbekli Tepe in Turkey are making archaeologists rethink the roots of civilization.

A half-century after Apollo, the Artemis missions aim to bring astronauts back to the Moon and establish a lunar space station. Follow the Artemis II engineers and crew on the perilous 10-day journey to orbit the Moon.

An invisible force is causing chaos around the globe. Follow scientists racing to understand the catastrophic "rain bombs" that are sinking ships and downing planes. Can they learn to predict these devastating weather events and save lives?

Follow archaeological investigations into the dramatic origins of democracy in Greece 2,500 years ago. Mass graves and ancient ruins where tyrants were murdered shine new light on the birth of a revolutionary form of government.

Once a death sentence, cystic fibrosis now faces an apparent miracle cure. Follow the decades-long scientific quest, fueled by desperate parents, that led to this breakthrough with potential implications for the future of personalized medicine.

For millennia, Indigenous peoples in North America have practiced a unique form of science. From navigating the featureless Arctic to building energy-efficient homes in the desert, see how cultural traditions have led to remarkable innovations.