After decades in the shadows, UFOs are being studied seriously. Are they weather balloons, optical illusions, secret military technology? Or something else? Follow scientists as they try to unravel the mystery of the strangest objects in our skies.

After decades in the shadows, UFOs are being studied seriously. Are they weather balloons, optical illusions, secret military technology? Or something else? Follow scientists as they try to unravel the mystery of the strangest objects in our skies.

After decades in the shadows, UFOs are being studied seriously. Are they weather balloons, optical illusions, secret military technology? Or something else? Follow scientists as they try to unravel the mystery of the strangest objects in our skies.

It's hard to imagine that large meteorites colliding with Earth with the power of 20 Hiroshima bombs can bring anything but cataclysm. Ever since a link was made between meteorite impacts and mass extinctions on Earth, we have feared rogue asteroids destroying our planet. There is no doubt, these objects can be takers of life - but is it possible that giant asteroid impacts were actually essential for the creation of life on Earth NOVA follows a series of discoveries behind a remarkable theory of how the violent destroyers of life could also have created the very special conditions - of chemistry and energy - that made life possible in the first place.

It's hard to imagine that large meteorites colliding with Earth with the power of 20 Hiroshima bombs can bring anything but cataclysm. Ever since a link was made between meteorite impacts and mass extinctions on Earth, we have feared rogue asteroids destroying our planet. There is no doubt, these objects can be takers of life - but is it possible that giant asteroid impacts were actually essential for the creation of life on Earth NOVA follows a series of discoveries behind a remarkable theory of how the violent destroyers of life could also have created the very special conditions - of chemistry and energy - that made life possible in the first place.

It's hard to imagine that large meteorites colliding with Earth with the power of 20 Hiroshima bombs can bring anything but cataclysm. Ever since a link was made between meteorite impacts and mass extinctions on Earth, we have feared rogue asteroids destroying our planet. There is no doubt, these objects can be takers of life - but is it possible that giant asteroid impacts were actually essential for the creation of life on Earth NOVA follows a series of discoveries behind a remarkable theory of how the violent destroyers of life could also have created the very special conditions - of chemistry and energy - that made life possible in the first place.

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.

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.

A visionary astronomer in West Africa attempts a high-stakes observation of a distant asteroid vital to a NASA mission. From prehistoric ruins to Islamic skywatchers, explore the heritage and future of African astronomy.

Imagine a world where your furry best friend could tell you exactly what they're thinking. A growing number of dog owners claim this is already happening, thanks to innovative word buttons that seem to unlock a new realm of canine communication. But are these dogs truly understanding what we're saying - and talking back Are they really thinking creatively, applying words in new contexts Or is this just clever conditioning To find out, scientists are conducting the largest animal communication study in history, analyzing millions of button presses from thousands of dogs worldwide. Witness astonishing moments that challenge our assumptions about animal intelligence, from dogs that seemingly engage in conversations to those who learn new words with incredible speed. Prepare to question everything you thought you knew about the minds of dogs and discover just how far their linguistic abilities might stretch.

Imagine a world where your furry best friend could tell you exactly what they're thinking. A growing number of dog owners claim this is already happening, thanks to innovative word buttons that seem to unlock a new realm of canine communication. But are these dogs truly understanding what we're saying - and talking back Are they really thinking creatively, applying words in new contexts Or is this just clever conditioning To find out, scientists are conducting the largest animal communication study in history, analyzing millions of button presses from thousands of dogs worldwide. Witness astonishing moments that challenge our assumptions about animal intelligence, from dogs that seemingly engage in conversations to those who learn new words with incredible speed. Prepare to question everything you thought you knew about the minds of dogs and discover just how far their linguistic abilities might stretch.

A visionary astronomer in West Africa attempts a high-stakes observation of a distant asteroid vital to a NASA mission. From prehistoric ruins to Islamic skywatchers, explore the heritage and future of African astronomy.

With the help of scientists and genealogists, filmmaker Byron Hurt and his family members search for their ancestors. Follow their journey as they hunt for new details of a history long obscured by the enduring legacy of slavery.

Uncover the surprising ancient origins of mammals, a story that began long before the dinosaurs' reign. Surveying Earth's tumultuous past reveals how some of our earliest ancestors, the therapsids - creatures that looked like reptiles but were starting to develop mammalian traits - survived multiple global catastrophes. Through remarkable adaptations like burrowing and the emergence of warm-bloodedness, they forged a lineage that persevered against all odds. Fascinating fossil clues and cutting-edge science reveal how a small, resilient group of therapsids faced extinction events, outlived giants, and ultimately gave rise to the diverse world of mammals we know today, including us.

Uncover the surprising ancient origins of mammals, a story that began long before the dinosaurs' reign. Surveying Earth's tumultuous past reveals how some of our earliest ancestors, the therapsids - creatures that looked like reptiles but were starting to develop mammalian traits - survived multiple global catastrophes. Through remarkable adaptations like burrowing and the emergence of warm-bloodedness, they forged a lineage that persevered against all odds. Fascinating fossil clues and cutting-edge science reveal how a small, resilient group of therapsids faced extinction events, outlived giants, and ultimately gave rise to the diverse world of mammals we know today, including us.

With the help of scientists and genealogists, filmmaker Byron Hurt and his family members search for their ancestors. Follow their journey as they hunt for new details of a history long obscured by the enduring legacy of slavery.

This two-hour feature documentary produced by acclaimed Oscar-nominated filmmaker Stanley Nelson traces the roots of systemic racism in our medical system and the biological impacts of discrimination on the body to understand why Black Americans experience such disproportionately poor health outcomes - and did long before COVID-19 highlighted the devastating health disparities in our country.

An invisible, unpredictable atmospheric force is wreaking havoc across the globe - sinking superyachts, flattening forests, and bringing down airliners. Follow scientists as they race to understand these catastrophic weather events, exploring how they form, what causes their devastating impacts, and how we might someday learn to predict them. From high-tech simulations and drone expeditions into thunderclouds to possible links with climate change, join investigators on the cutting edge of research to discover what's truly behind these terrifying 'rain bombs' and how we can protect ourselves from their growing power.

An invisible, unpredictable atmospheric force is wreaking havoc across the globe - sinking superyachts, flattening forests, and bringing down airliners. Follow scientists as they race to understand these catastrophic weather events, exploring how they form, what causes their devastating impacts, and how we might someday learn to predict them. From high-tech simulations and drone expeditions into thunderclouds to possible links with climate change, join investigators on the cutting edge of research to discover what's truly behind these terrifying 'rain bombs' and how we can protect ourselves from their growing power.

An invisible, unpredictable atmospheric force is wreaking havoc across the globe - sinking superyachts, flattening forests, and bringing down airliners. Follow scientists as they race to understand these catastrophic weather events, exploring how they form, what causes their devastating impacts, and how we might someday learn to predict them. From high-tech simulations and drone expeditions into thunderclouds to possible links with climate change, join investigators on the cutting edge of research to discover what's truly behind these terrifying 'rain bombs' and how we can protect ourselves from their growing power.

On a remote hillside in modern-day Turkey sits Gpbekli Tepe, the oldest temple on Earth. For centuries, archaeologists believed it was a religious center built by nomadic hunter-gatherers before the rise of civilization. But groundbreaking new evidence reveals that a sophisticated community of settled hunter-gatherers, not nomads, lived here year-round for centuries. This startling discovery could be the missing link in humanity's momentous transition from hunting to farming. Follow experts as they use new digs and shattered skulls to piece together a captivating story that could forever change our understanding of the roots of civilization.

On a remote hillside in modern-day Turkey sits Gpbekli Tepe, the oldest temple on Earth. For centuries, archaeologists believed it was a religious center built by nomadic hunter-gatherers before the rise of civilization. But groundbreaking new evidence reveals that a sophisticated community of settled hunter-gatherers, not nomads, lived here year-round for centuries. This startling discovery could be the missing link in humanity's momentous transition from hunting to farming. Follow experts as they use new digs and shattered skulls to piece together a captivating story that could forever change our understanding of the roots of civilization.

When the colossal Ever Given container ship crashed into the bank of the Suez Canal in March 2021, international supply chains ground to a halt. How could such a disaster happen? And can the investigation help prevent future accidents?

On March 26, 2024, a massive container ship plowed into the Francis Scott Key Bridge, killing six highway workers. How did the ship lose control? Why did the bridge fail so catastrophically? And how many other bridges around the world are at risk?