Constantine's death would drive a crack through the Roman Empire, splitting it into West and East. Over the next several hundred years, parts of it would even fall to foreign invaders. But a new capital would rise to take its place: Constantinople.

Constantine's Death Threatened to Split the Roman Empire (3:16)

Inspired by Odysseus, historian Bettany Hughes is embarking on a journey through the Greek Islands. But at the island of Naxos, a different Greek hero appears to be calling: Dionysius, the God of wine and good times.

This Greek Island Has Been Partying for 2,500 Years (3:51)

Even by primate standards, cotton-top tamarins have highly complex communication abilities. Adults produce 40 distinct sounds–each with their own meaning. They even have one for humans! And while tasks are shared, including raising a family, it’s the alpha female that makes all the big decisions.

These Monkeys Have Complex Communication Skills (2:18)

The great diving beetle is a fast underwater swimmer and a voracious hunter. It can stay submerged for periods of up to 30 minutes a time—thanks to a makeshift oxygen tank in its wing case.

The Great Diving Beetle Is an Impressive Underwater Hunter (2:19)

When you’ve paid over $75 million for a luxury apartment in this New York skyscraper, you also get state-of-the-art protection against winds. Left unchecked, these can be powerful enough to sway the entire structure!

How to Stop a New York Skyscraper From Swaying (1:37)

A male Arctic Fox is searching for his mate amid the snow-cloaked landscape. Arctic foxes separate and unite every year–but their bonds are lifelong.

Arctic Fox Couple Reunites in the Freezing Cold (2:26)

It takes a special breed of animal to handle the Michigan winter—and the river otter is better prepared than most. But preparation is half the battle, and it starts with a roll in the snow to keep its fur coat insulated. The waters in the Upper Peninsula of Michigan freeze over fast in winter–and river otters need to work just as fast to keep holes open in the ice. If they close, the otters lose access to fish.

This River Otter Is Bracing for a Harsh Michigan Winter (3:10)

A pair of leopard cubs chase, pounce and play among the craggy rocks. Their mother is away searching for food, and it’s a great opportunity for them to hone their own hunting skills.

A Pair of Leopard Cubs Take Advantage of Mom's Absence (3:04)

Our Native Daughters is a group of four renowned black musicians determined to tell their own history through folk music. The result is a musical work that exudes power and truth.

Sneak Peek: Reclaiming History: Our Native Daughters (1:27)

The power behind the music of Our Native Daughters comes from giving voice to the struggles of those who came before us—and few have struggled to be heard as much as black women.

Elevating the Forgotten Histories of Black Women Through Folk Music (2:38)

For the female lesser long-nosed bats in the Pinacate Desert, food is scarce. One possible source of nutrients: pollen from the saguaro cactus, whose milk-white petals open up only one night a year.

This Cactus Opens Its Petals Only One Night a Year (2:32)

Sled dogs, such as the Canadian Inuit, are capable of traveling long distances in some of the iciest regions of the planet. It’s a trait that they inherited from their wolf ancestors.

Canadian Inuits Get Their Wilderness Chops From Wolves (3:08)

With a dense coat, a powerful mass of muscle and a large head ideally suited for clearing away snow and locating buried grass, bison are built for frigid conditions in Yellowstone. If it wasn’t for a hidden herd in the deepest reaches of this National Park, bison would have been wiped out in the late 1800s. Today, thousands of them thrive.

Yellowstone Bison Are Built for Winter Survival (3:55)

In just a few months in 2018, the landscape of Mars seemed to disappear, as a thick, red cloud enveloped the planet. It was one of Mars’ signature sand storms–obscuring the entire surface.

How a Powerful Dust Storm Made Mars 'Disappear' In 2018 (2:06)

Mariner 9 showed that the surface of Mars closely resembled that of the moon. But the shape of the craters and canyons found there suggest that at one point, its surface was overrun by flowing water.

How Ancient Water May Have Shaped the Surface of Mars (5:07)

Wales has no shortage of magnificent castles—from the impenetrable stronghold of Harlech Castle, to the fierce fortifications of Carnarvon. Wales boasts a series of castles known as the Iron Ring, built as part of Edward I’s determination to stamp his authority over the tribes of Wales.

Why Wales Is the Place to Go for Medieval Castles (3:06)

The sinking of the Titanic and the ensuing loss of life was horrific enough to prompt major action. In 1914, 16 nations formed an international patrol to scour the oceans for icebergs.

The Sunken Titanic Led to Iceberg Patrols in the Atlantic (2:34)

A male golden dart frog uses his unique singing ability to attract a mate. It’s hard to believe that such a melodic sound can come from one of the most toxic creatures in the world. But he has to earn the right to sing—by defeating all the rival males in his territory.

The Most Toxic Frog Has a Beautiful Singing Voice (2:49)

In the early 20th century, the medical establishment became fixated with the idea that gay people could be “cured.” To achieve this, they turned to a litany of brutal practices: from electrotherapy to lobotomies.

What It Was Like to Be Gay During WWII (3:33)

Inveraray Castle is home to one of the most important private collections of historical archives in all of Britain—a collection of records, documents and diaries, dating back to the 13th century. The restoration of the private archival documents is a gradual, painstaking and expensive process. In fact, a single damaged page can cost up to a hundred pounds to repair.

Inveraray Castle: An Ancient Archive Treasure Trove (2:37)

In 2014, Alan Eustace accomplished the highest altitude free fall jump ever recorded, from nearly 26 miles above earth. To accomplish this safely, he wore a revolutionary new liquid cooling suit attached to a balloon, to lift him into the stratosphere.

How Alan Eustace Performed the World's Highest Free Fall Jump (3:52)

One of the most evocative and breathtakingly beautiful coastal landscapes in Britain is the historic county of Cornwall. It’s also a place steeped in legend, including that of Britain’s legendary King Arthur.

Cornwall, the Most Beautiful Place in Britain (2:18)

Northumberland is one of Britain’s most historic regions, an archaeological treasure trove of impressive buildings that date back to the Roman conquest: From Hadrian’s Wall to the Vindolanda Fort.

Britain's Amazing Roman Structures That You Can Visit (2:15)

At the end of the Cretaceous period, only one mega-predatory dinosaur ruled North America: Tyrannosaurus rex. The Borealopelta was alive around the mid-Cretaceous era, so eyes turn to one of T. rex's ancestors to figure out why it disappeared.

The Shift in Prehistoric Apex Predators (2:58)

In 1938, a German-Jewish businessman, Benno Thorsch, traded his camera factory in Dresden for a new life in Detroit and, later, Los Angeles. With the rise of the Third Reich, it was a move that almost certainly saved his family’s life from the Nazis. And as a young boy, Steven Spielberg would even visit the camera shop in Studio City, California.

L.A. Welcomes a Camera Maker Fleeing Nazis (1:37)

The Orkneys, an archipelago of islands off the northern coast of Scotland, are home to some of the greatest neolithic treasures in western Europe: from the settlement of Skara Brae to the Ness of Brodgar.

Scotland's Most Mysterious Stone Age Settlements (2:11)

In 1619, George Yeardley, the newly appointed governor of Jamestown, made history: He convened 22 elected members of a burgeoning commonwealth, creating the first democratic assembly in America.

Was a Jamestown Governor the Father of U.S. Democracy? (1:57)

Humans are the dominant species on the planet—and sometimes, that puts a strain on other animals. But the way coyotes have adapted to urban living is giving scientists hope that co-existence is possible.

Chicago's Urban Coyotes Are Fascinating Scientists (2:01)

Pyramids were supposed to be royal burial sites, crammed with unimaginable treasures. And yet they were built to be as conspicuous as possible, attracting the attention of grave robbers.

Why Pyramids Were Effective Advertisements for Tomb Robbers (2:48)

A team of vets working to capture a group of orangutans living along the banks of the Rungan River, are waylaid by the leader of the group—an aggressive male, named Kasper.

This Aggressive Male Orangutan Refuses to Be Sedated (3:46)