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.

In New York City, a team of elite engineers and construction workers are on a mission to build the ultimate airport. Follow their ups and downs as they race to build a new, world-class LaGuardia on the site of one of America's busiest aviation hubs.

Why are birds the only dinosaurs still alive today? Rare fossil discoveries are revealing the secrets of bird evolution, telling the story of how some resilient feathered dinos became the vast array of colorful bird species that fill our skies.

Follow archaeologists as they discover a long-lost ancient cemetery in Egypt's sacred desert. Treasures emerge unlike anything seen by the team, revealing details of a unique period when women had remarkable power.

New archaeological finds in Pompeii are revealing that the city, hailed as a sophisticated jewel of the Roman Empire, hid a very dark side. As the evidence unfolds, a much more complex picture of the fated city comes into view.

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?

In April 1775, war breaks out in Britain's most troublesome territory. Now the American Colonial Army faces what seems like an impossible challenge - to militarily defeat the world's most powerful nation. We've all heard the stories of pluck and valor, but what really led to Britain's defeat and the birth of the United States? American and British archeologists and historians unpack the real story of technology, innovation, and luck that determined the outcome of key battles - from the Massachusetts militias who fired the first shots to the Naval clashes between British and American ships of the line. This unique film brings the latest science to bear to reveal the hidden history of the Revolutionary War.

What would the restoration of Earth's forests mean in the fight against climate change? Follow researchers around the globe as they race to understand how nature processes and responds to carbon on the largest scales and how microorganisms, plants, animals, and humans combine to sustain healthy ecosystems. NOVA's cameras travel to spectacular forest landscapes in Costa Rica, Canada, Brazil, Madagascar, and other places as a global team of scientists gather data on how forests work and try to figure out how they can help tackle the twin threats of climate change and the existential threat of species extinction.

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.

Surprisingly little is known about the behavior of cars and drivers in uncontrolled, real-world accidents, despite rigorous testing in laboratory-controlled crashes. Now, a first-of-its-kind experiment aims to discover what really happens in a multi-vehicle pileup and how cars and driving could be made safer.

Surprisingly little is known about the behavior of cars and drivers in uncontrolled, real-world accidents, despite rigorous testing in laboratory-controlled crashes. Now, a first-of-its-kind experiment aims to discover what really happens in a multi-vehicle pileup and how cars and driving could be made safer. In the second episode of this two-part special, forensic analysis is put to the test. Real-life crash scene investigations have very little data to work with, so are they accurate? And what can we learn about car safety when there is actual data to show exactly what happened?

Where did humans come from, and what makes us unique? Discover the remarkable origins of Homo sapiens, and the crucial moments of innovation, communication, and ritual that set us on our path.

Follow Homo Sapiens as they venture across the world, farther than any other human species. See how they invented new tools to thrive in challenging environments - and meet the mysterious hobbit-like humans they may have encountered along the way.

Discover how Homo sapiens outlasted Neanderthals - and how Neanderthals helped make us who we are today.

Homo sapiens encounter new challenges as they venture into an unknown world.

Discover how two revolutionary ancient inventions changed the course of humanity forever.

Explore mysterious 9,000-year-old Stone Age megastructures found in the Arabian Desert.

Find out why deadly flash floods are on the rise and how we can protect ourselves from them.

From ammonia leaks to Space Shuttle disasters to a spacewalk gone terribly wrong, astronauts and Mission Control insiders relive the most terrifying moments during construction of the International Space Station.

Witness life-or-death decisions 250 miles above Earth, as astronauts and Mission Control work together to survive moments of high danger on board humanity's remarkable orbiting laboratory, the International Space Station.