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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. Follow a scientific detective story that is challenging everything we thought we knew about this ancient metropolis. (Premiered January 28, 2026 at 9 pm on PBS)

New evidence sheds light on the remarkable life – and mysterious collapse – of the ancient jungle city.

Angkor: Hidden Jungle Empire

Asteroids in the sky traveling crashing towards Earth

Imagine a time when Earth was a molten, volcanic wasteland, heavily bombarded by colossal asteroids. We’ve long feared these cosmic impacts as destroyers of life, but what if they were the key to our very existence? Explore a revolutionary theory suggesting that these violent collisions provided the essential ingredients – water, minerals, and energy – needed for life to ignite on our planet. Discover how scientists are unearthing evidence from lunar rocks and ancient impact craters, revealing that the very objects known for extinguishing life might have actually sparked it. (Premiered January 21, 2026 at 9 pm on PBS)

What if violent asteroid impacts actually jump-started life on Earth? Explore a dramatic theory.

Asteroids: Spark of Life?

General - US & Territories

Small black unidentified flying object zooming across night vision background

For decades UFOs have captivated the public, even as many scientists saw them as too taboo to investigate. Now, after highly publicized sightings of unidentified objects by Navy pilots, UFOs are moving out of the shadows and into the light, as NASA pledges to study them scientifically. So what does science have to say? Though some are identified as balloons or drones, weather phenomena, or optical illusions, others remain mysterious. Could they be the result of secret new technology developed by other governments – or our own? And what would it take for alien engineers to traverse vast distances to send probes or visit Earth from other solar systems? Explore the evidence, as astrophysicists and engineers use new technologies to investigate the strangest objects in our skies. (Premiered January 22, 2025 at 9 pm on PBS)

Can science reveal the secrets of mysterious objects seen in our skies?

What Are UFOs?

Colossal explosions shake a remote corner of the Siberian tundra, leaving behind massive craters. In Alaska, a huge lake erupts with bubbles of inflammable gas. Scientists are discovering that these mystifying phenomena add up to a ticking time bomb, as long-frozen permafrost melts and releases vast amounts of methane, a potent greenhouse gas. What are the implications of these dramatic developments in the Arctic? Scientists and local communities alike are struggling to grasp the scale of the methane threat and what it means for our climate future. (Premiered February 2, 2022)

In the Arctic, enormous releases of methane, a potent greenhouse gas, threaten the climate.

Arctic Sinkholes

In this two-hour special, renowned paleontologist Kirk Johnson takes us on an epic adventure through time at the polar extremes of our planet. Following a trail of strange fossils found in all the wrong places—beech trees in Antarctica, hippo-like mammals in the Arctic—Johnson uncovers the bizarre history of the poles, from miles-high ice sheets to warm polar forests teeming with life. What caused such dramatic changes at the ends of the Earth? And what can the past reveal about our planet’s climate today—and in the future? (Premiered February 5, 2020)

Paleontologist Kirk Johnson explores the dynamic history—and future—of ice at the poles.

Polar Extremes

6 footprints embedded in beige, crusty desert surface

Thousands of ancient footprints stretch for miles across New Mexico’s White Sands National Park, capturing moments when Ice Age humans encountered now-extinct beasts, including mammoths and enormous ground sloths. These footprints tell an intimate story about what life was like during the Ice Age and reveal surprising new evidence about when humans arrived in North America. (Premiered May 25, 2022)

Ancient footprints provide new evidence of humans and extinct giant beasts of the Ice Age.

Ice Age Footprints

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. (Premieres February 4, 2026 at 9 pm on PBS.)

Do speech buttons really allow dogs to talk to us? Scientists investigate.

Can Dogs Talk?

NOVA revolves around a simple premise: the world of science is exciting! For NOVA viewers, science means adventure and exploration--because from ants to aliens, this weekly documentary series probes the far reaches of earth, sea and stars.  NOVA proves that science is neither secret lore nor sacred ritual but rather, at its heart, a lifelong journey of discovery.

You might sign up for a dating app to find the love of your life. But while you’re swiping, these apps are collecting all kinds of information about you. What do you they know about you? And what are they doing with your data?

You might be collecting matches, but dating apps are collecting your data.

What Dating Apps Know About You

Don’t fret – at-risk cheeses are not going to disappear instantly but they getting much harder to make.

The culprit is a lack of microbial biodiversity in the mold used to make iconic French cheeses.

These cheeses are at risk of going extinct

In California an AI tool uses more than a thousand mountaintop surveillance cameras to look for early signs of wildfires.

Firefighters are using AI to find wildfires before they explode.

How A.I. is fighting wildfires

A product you were just talking about pops up in an online ad. How? Advertising algorithms are so good that they may know what you want even before you do.

It doesn’t have to – advertisers may already have all the information they want to know about you.

Is your phone listening to you?

Invisible and mysterious, dark matter shapes the cosmos, but scientists are still trying to figure out what exactly it is.

A team of researchers hunt for dark matter deep underground in the Black Hills of South Dakota.

The Deepest Underground Lab in the U.S.

Four and a half billion years ago, Earth was battered by relentless asteroid impacts powerful enough to vaporize oceans and melt its crust. Despite the chaos, life emerged anyway.

What studying the surface of the Moon revealed about Earth’s apocalyptic youth.

When Earth Was Bombarded by Asteroids

Small mammal ancestor emerging from burrow

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 animals faced extinction events, outlived giants, and ultimately gave rise to the diverse world of mammals we know today, including us. (Premiering February 11, 2026 at 9 pm on PBS)

Explore mammals’ surprising origins, long before the age of dinosaurs.

Mammal Origins

Picture of the original construction of the Eiffel Tower

Explore the revolutionary engineering behind Paris’s iconic landmark. Completed in just over two years for the 1889 World’s Fair, the iron tower smashed the record for the tallest structure on Earth, ushering in a new age of global construction that reached for the skies. How did the engineers do it? Follow the innovations, successes, and failures that made one of the most famous buildings on the planet possible. (Premiered February 14, 2024 at 9 pm on PBS)

Explore the engineering behind Paris’s iconic landmark, the tallest structure of its time.

Building the Eiffel Tower

On a remote hillside in modern-day Turkey sits Göbekli 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. (Premieres February 25 at 9 pm on PBS)

Surprising evidence at the world’s oldest temple overturns our understanding of human history.

Stone Age Temple Mystery

Aerial view of a container ship lodged diagonally across a canal with small tugboats surrounding it

When the bow of the colossal Ever Given container ship plowed into the bank of the Suez Canal on March 23, 2021, international supply chains ground to a halt. What went wrong? Follow the dramatic efforts to free the ship and the investigation into one of the most expensive shipping disasters ever. Maritime experts analyze other recent accidents and try to figure out how such devastating crashes could be prevented. (Premiered May 18, 2022)

How could a single ship cause a major supply chain crisis around the globe?

Why Ships Crash

On March 26, 2024, the world collectively gasped as a massive container ship, the Dali, lost control and plowed into the landmark Francis Scott Key Bridge in Baltimore. The busy four-lane bridge suffered a catastrophic collapse and crashed into the Patapsco River. Six highway workers were killed, and the Port of Baltimore – a crucial link in the global shipping chain on the Eastern Seaboard of the United States – was blocked by thousands of tons of twisted steel and concrete. How did a modern ship lose all power and propulsion? And why did the bridge fail so catastrophically? Follow the high-stakes rescue and recovery, the efforts to reopen the port, and the investigations into what went wrong and how many other crucial bridges are at risk. (Premiered February 26, 2025 at 9 pm on PBS)

Follow the investigation into the deadly container ship collision that closed the Port of Baltimore.

Baltimore Bridge Collapse

Purple graphic of a brain sketch and neurons.

Is what you see real? Join neuroscientist Heather Berlin on a quest to understand how your brain shapes your reality, and why you can’t always trust what you perceive. In the first hour of this two-part series, learn what the latest research shows about how your brain processes and shapes the world around you, and discover the surprising tricks and shortcuts your brain takes to help you survive. (A two-part series. Part 1 premiered May 17, 2023)

Neuroscientists discover the tricks and shortcuts the brain takes to help us survive.

Your Brain: Perception Deception

Green graphic of a brain sketch and neurons.

Are you in control, or is your brain controlling you? Dive into the latest research on the subconscious with neuroscientist Heather Berlin. Sleepwalking, anesthesia, game theory, and more reveal surprising insights in this eye-opening journey to discover what’s really driving the decisions you make. (Episode 2 of a two-part series, premiered May 24, 2023)

Dive into the subconscious to see what’s really driving the decisions you make.

Your Brain: Who's in Control?

A powerful downburst (“rain bomb”) releases a column of rain beneath a thunderstorm.

An invisible, unpredictable atmospheric force is wreaking havoc across the globe, sinking superyachts and bringing down planes. 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. (Premiering April 22 at 9 pm on PBS)

A deadly—and growing—global weather phenomenon mystifies scientists.

Rain Bombs

How big is the universe? If it began with the Big Bang, will it also have an end? Is there life beyond our planet? Questions like these inspired the launch of Voyager I in 1977 and have driven innovative space research and exploration ever since. Trace ground-breaking discoveries that have transformed our picture of the universe, from an age when we knew of no planets beyond our solar system, to today, when we have evidence of thousands and estimate trillions more. And follow the teams trying to solve two of the biggest mysteries in cosmology today: What are dark matter and dark energy? (Premiered May 22 at 9 pm on PBS)

Explore big discoveries that have revolutionized our understanding of the universe.

Decoding the Universe: Cosmos

When we look at the world at the tiniest scales in the subatomic realm, things get weird – very weird. Welcome to the quantum universe, where particles can spin in two directions at once, observing something changes it, and something on one side of the galaxy can instantly affect something on the other, as if the space between them didn’t exist. Buckle up for a wild ride through the discoveries that proved all of this to be true and paved the way for the digital technologies we enjoy today – and the powerful quantum sensors and computers of tomorrow. Premiered November 6, 2024 at 9 pm on PBSCorrection: The original version of this film had misplaced punctuation, which falsely implied that in 1974, Stephen Hawking was the first to predict black holes. The film, captions, and transcript have been amended to clarify that in 1974, Stephen Hawking first predicted the phenomenon now known as Hawking radiation, referred to in the film as the “Achilles’ heel” of black holes.

Dive into the universe at the tiniest – and weirdest – of scales.

Decoding the Universe: Quantum

A skeleton of a whale in a desert-like area.

In Egypt’s Sahara Desert, massive skeletons with strange skulls and gigantic teeth jut out from the sandy ground. This fossil graveyard, millions of years old, is known as the “Valley of the Whales.” Now, paleontologists have unearthed a whole new species of ancient whale dating to 43 million years ago, and this predator wasn’t just able to swim – it also had four legs and could walk. Follow scientists as they search for new clues to the winding evolutionary path of mammals that moved from the land into the sea to become the largest animals on Earth. (Premiered January 31, 2024 at 9 pm on PBS.)

Giant fossils uncovered in the Sahara Desert reveal new secrets of how whales evolved.

When Whales Could Walk

Sir David Attenborough investigates a unique site in southern England where amateur fossil hunters uncovered giant mammoth bones and evidence of Neanderthals. A team of paleontologists and archaeologists soon discover that the site preserves rare evidence of the extinct beasts and early human inhabitants of Britain dating to over 200,000 years ago. What skills did the early humans have to help them survive during the Ice Age? How did they hunt and protect themselves against formidable creatures such as mammoths? With hands-on experiments with replicas of Neanderthal-era spears and stone tools, the world of prehistoric Britain comes to life. (Premiered February 16, 2022)

Sir David Attenborough explores a site with traces of ancient mammoths and Neanderthals.

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Can Dogs Talk?

Upcoming Schedule

Mammal Origins

Building the Eiffel Tower

Stone Age Temple Mystery

Episodes

Angkor: Hidden Jungle Empire

Asteroids: Spark of Life?

What Are UFOs?

Arctic Sinkholes

Polar Extremes

Ice Age Footprints

Shorts

What Dating Apps Know About You

These cheeses are at risk of going extinct

How A.I. is fighting wildfires

Is your phone listening to you?

The Deepest Underground Lab in the U.S.

When Earth Was Bombarded by Asteroids

Watch Page

Hero Area

Can Dogs Talk?

Upcoming Schedule

Mammal Origins

Building the Eiffel Tower

Stone Age Temple Mystery

Episodes

Angkor: Hidden Jungle Empire

Asteroids: Spark of Life?

What Are UFOs?

Arctic Sinkholes

Polar Extremes

Ice Age Footprints

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Shorts

What Dating Apps Know About You

These cheeses are at risk of going extinct

How A.I. is fighting wildfires

Is your phone listening to you?

The Deepest Underground Lab in the U.S.

When Earth Was Bombarded by Asteroids