Standing in the Roman senate, Octavian read out the shocking details of Mark Antony's will. It was a devastating revelation that immediately gave the young schemer a major advantage over his soon-to-be disgraced rival.

How Octavian Succeeded in Discrediting Mark Antony (3:18)

In a battle for herd supremacy, a brutal battle is about to break out. The current king gelada is experienced and battle-hardened, but his brother is younger and hungrier—who will come out on top?

Two Gelada Brothers Viciously Fight for Breeding Rights (3:04)

When Octavian emerged as the sole ruler of Rome, he immediately began a sophisticated PR campaign to clean up his image. He ditched the military regalia and presented himself as a man of peace.

How Octavian Successfully Rebranded Himself (3:30)

The strict laws of Prohibition were selectively enforced, and the brunt of their legal impact fell on minority and working-class groups while vigilante groups used "Prohibition enforcement" as cover. In this way, Prohibition helped fuel the re-emergence of one of the most notorious hate groups of all time: the KKK.

How Prohibition Led to the Revival of the Ku Klux Klan (3:01)

From Radio City Music Hall to '30 Rock,' Rockefeller Center was a construction project befitting of the city's ambition. But its build was an epic affair—and came with an eye-watering price tag.

The Staggering Price Tag of NYC's Rockefeller Center (1:42)

Anoles are small lizards with an abundance of charm. There are over 400 species of anoles, scattered all over the American and Caribbean tropics: from remote rainforests in the Bahamas, to busy cities on the mainland. In recent years, anoles have come to be viewed as a great model organism for understanding key evolutionary principles. They’ve helped scientists tackle many of the big questions in biology: from the links between ecology and evolution, to the effects of physiology and behaviour. The results are nothing short of eye-opening.

The Lizard's Tale 101: Meet the Anoles (6:22)

Mount Chimborazo of Ecuador may be a dormant volcano, but its neighbors are anything but. In fact, the nearby Reventador volcano has erupted more than 25 times in the past 500 years.

This Dormant Volcano in Ecuador Is Very Much the Exception (2:11)

If nectar is nature's gold, then the angel's trumpet flower is Fort Knox. Around a foot long in length, it's too deep for most birds and its walls are too thick for most to break down.

This Remarkably Long Flower Stores Its Nectar Deep Inside (2:58)

While stars like Jimmy Stewart and Clark Gable enlisted and served during WWII, directors like John Ford would bring military footage of the Pacific conflict straight to American viewers.

How Hollywood Encouraged Recruitment for WWII (2:38)

When you look at the sheer scale of her athletic achievements, it's a wonder she's not better known today: boxing star, three-time Olympic medalist, and one of the best women's golf players of all time.

The Most Famous Female Athlete You've Never Heard Of (1:37)

On September 2, 1945, Japan delivered its unconditional surrender in WWII. Twelve million American troops went home as civilians, to work and raise families--ushering the U.S. into a new age of global leadership.

Japan's Surrender in WWII Ushered in a New World Order (2:06)

An anxious student pilot is attempting to land a C2-A Greyhound on a U.S. aircraft carrier. It's part of a qualifications test she must pass ten times in order to be certified as a C2-A pilot.

Here's What it Takes to Become a Certified C2-A Pilot (3:21)

Two rival explorers have teamed up on a very special project in the Baltic sea. Their aim is to locate and explore the wreck of one of the most historic ships in Swedish history: Mars.

Team of Explorers Uncover Famous Sunken Ship (3:23)

The AC-130 is the world's biggest flying artillery gunship - nicknamed 'Hell in the Sky.' With three side-firing weapons, a 25mm Gatling gun, a 40mm Bofors cannon, and a 105mm howitzer, it's easy to see why it got its name.

Deadly AC-130 Gunship in Action Firing All Its Cannons (3:07)

It's November 2001, and lieutenant colonel Allison Black is a navigator on an AC-130 gunship flying over Afghanistan. She recounts a typical combat mission during operation Enduring Freedom.

AC-130 Gunship Navigator Recalls Taliban Combat Mission (2:56)

The USS Guadalcanal has spotted a German sub in the waters off the coast of Madeira. They immediately order a strike with the navy's new and devastating weapon: the hedgehog.

A U.S. Warship Fires an Anti-Sub Weapon on a German U-Boat (4:24)

Allied POWs rescued in the South China Sea have an incredible story to tell. They'd been kept in a secret prison camp in Thailand, where their Japanese captors forced them to build a railroad from Thailand to Burma.

These POWs Were Forced to Build the Bridge Over River Kwai (2:34)

Domesticating horses gave the ancient Scythian nomads speed and mobility. But they were also a vital source of nutrition, providing both meat and milk.

Why Horses Are So Vital in the Lives of These Nomads (1:57)

After a long-drawn out conflict in the Pacific, the troops needed a morale boost. And the United Service Organizations provided it in spades, thanks to spectacular shows by Hollywood legends like Bob Hope and Joe E. Brown.

Why USO Tours Were Vital for Troop Morale in the Pacific (2:01)

In the 1560s, Eric XIV of Sweden was determined to change the way naval battles were fought. The result was Mars: a giant of a warship that would rely on artillery and firepower to devastate her rivals.

This Swedish King Built a Warship That Redefined Naval Combat (3:21)

It's November 1943 and a German U-boat has been brutally damaged in a fight with British warships and is limping its way to port. But the sub's onboard batteries are impaired - which means it can't dive to evade enemy ships.

This Badly Damaged German U-Boat Can't Dive for Cover (3:45)

A giraffe takes a long drink from a local watering hole, with watchful lions in close proximity. The giraffe isn't brave, just desperately thirsty, while the lions aren't lazy, they're just waiting for nightfall.

This Giraffe Risks Everything by Drinking in Lion Territory (2:25)

A female lioness has adapted her hunting skills in the face of an oppressive drought. She spots a nearby kudu, and decides to launch a solitary attack - in broad daylight.

Lioness Uses New Tactics to Take Down a Kudu (3:17)

A reactor failure on a K-19 nuclear sub in 1961 ended up killing several crew members due to radiation poisoning. It was a horrifying episode that would have ramifications for a later, top-secret Soviet operation.

How a Nuclear Sub Disaster Impacted This Soviet Operation (3:36)

A Soviet B-59 submarine has been spotted off the southeast coast of the U.S. mainland in 1962. The White House draws up a plan, but they don't know that this sub is carrying a devastating nuclear weapon on board.

What the U.S. Didn't Know About This Soviet Sub Near Cuba (3:28)

A British submarine on a mission to deliver supplies to Norwegian resistance fighters spots an unsuspecting enemy submarine in 1944. It's simply too good an opportunity to pass up.

A British Submarine Fires Its Torpedoes at a Nazi U-Boat (3:38)

It's May 1941, and the HMS Upholder has just claimed a major victory by sinking the Italian ship, Conte Russo. But it's come at a huge cost - it's damaged, has no torpedoes, and is being hunted by an Italian warship.

A British Submarine in WWII Goes from Hunter to Hunted (4:37)

The USS Barb had an unusual target in its sights in 1945 - one that wasn't even in the water. It was a Japanese supply train on the island of Karafuto.

This U.S. Sub Launched an Attack on a Japanese Train (3:07)

A British frigate fires on the USS Constitution - but its shots either miss or rebound off its tough oak hull. It's a feat of resilience that earns the American warship her proud nickname: Old Ironsides.

This 1812 American Frigate Could Take a Direct Cannon Hit (3:20)

During WWII, Nazi forces were preparing to take the coastal city of Tobruk and tighten their grip on North Africa. In response, the Allies turned their attention to another key strategic location: the tiny Mediterranean island of Malta.

This Tiny Island Was Key for Allied Forces to Secure North Africa (2:21)