This episode of "Conversations in Context," an interview series with Smithsonian Institution Secretary Lonnie G. Bunch III, examines key movements in black history, from Civil-Rights-era protests like the Greensboro sit-in to Black Lives Matter, and explores what lessons today’s movement can learn from the past.

Smithsonian Secretary Lonnie Bunch on the History of Protest in America (11:33)

The Vikings had dreams of exploration and conquest, and the longship was ideal for that purpose. Soon, they were able to venture as far as the Mediterranean and the Middle East.

What Made the Viking Longship So Terrifyingly Effective (3:52)

In the 19th century, there was a watermill almost every mile of the river, such was the huge demand for flour and bread. Today, Eastnor castle’s own mill is still operational–an important piece of local history.

This British Castle Still Has a Functioning Flour Mill (3:39)

The Vikings had dreams of exploration and conquest, and the longship was ideal for that purpose. Soon, they were able to venture as far as the Mediterranean and the Middle East.

What Made the Viking Longship So Terrifyingly Effective (3:52)

In the 19th century, there was a watermill almost every mile of the river, such was the huge demand for flour and bread. Today, Eastnor castle’s own mill is still operational–an important piece of local history.

This British Castle Still Has a Functioning Flour Mill (3:39)

Henry Ford was a genius who virtually created the automobile industry as we know it. But what's less lauded was his talent for publicity—and his ability to partner with other pioneers such as Ohio's Harvey Firestone.

How Henry Ford Found the Right Tires for Model T Cars (1:46)

In the 19th century, there was a watermill almost every mile of the river, such was the huge demand for flour and bread. Today, Eastnor castle’s own mill is still operational–an important piece of local history.

This British Castle Still Has a Functioning Flour Mill (3:39)

Boston’s iconic lighthouse, the Boston Light, is managed by a single person: Sally Snowman. She is the 70th keeper of the lighthouse since it was built over 300 years ago.

This Woman Manages America's Oldest Lighthouse (2:59)

Hadrian’s Wall was a 73 mile barrier stretching from coast to coast, splitting the warlike north of Britain from the more docile south. It was the Roman Empire’s way of imposing peace in a hostile land

The Roman Wall That Split Britain Into Two Parts (3:35)

It's 1933 and Mae West is just arriving at Grauman's Chinese Theater for the premiere of I'm No Angel. It draws fans from all over the country—as well as an organized protest from conservative religious groups.

How Conservative Groups Forced an Era of Censorship on Hollywood (1:38)

Julie Montagu, the American-born Viscountess Hinchingbrooke, is meeting up with an expert on 18th century dance. Her aim is to learn about the dances performed in that era.

Can You Learn the Steps to This 18th-Century Dance? (3:55)

The Chicago White Sox were heavy favorites going into the 1919 World Series. But they were defeated by the Cincinnati Reds - and it soon became clear that the game was rigged

The 1919 World Series Fix That Tarnished America's Pastime (3:26)

This episode of "Conversations in Context," an interview series with Smithsonian Institution Secretary Lonnie G. Bunch III, examines key movements in black history, from Civil-Rights-era protests like the Greensboro sit-in to Black Lives Matter, and explores what lessons today’s movement can learn from the past.

Smithsonian Secretary Lonnie Bunch on the History of Protest in America (11:33)

The Vikings had dreams of exploration and conquest, and the longship was ideal for that purpose. Soon, they were able to venture as far as the Mediterranean and the Middle East.

What Made the Viking Longship So Terrifyingly Effective (3:52)

It's 1933 and Mae West is just arriving at Grauman's Chinese Theater for the premiere of I'm No Angel. It draws fans from all over the country—as well as an organized protest from conservative religious groups.

How Conservative Groups Forced an Era of Censorship on Hollywood (1:38)

A flock of Andean condors have spotted a carcass in the Southern Cordillera region of Patagonia. It's a rare feeding opportunity in this barren land - and there will be a spirited competition for scraps.

These Condors Will Fight to Get a Seat at the Dinner Table (2:02)

The name sounds innocuous, maybe even charming. But it’s also known by another name—the ant lion—and it’s every bit as predatory and remorseless as that name sounds.

Doodlebug Is a Misleading Name for an Accomplished Assassin (3:04)

When birds need sleep, they do it on the fly--quite literally. They're able to enter a special kind of half-sleep state that lets them rest midair, which is especially important if you're a migratory bird, like the Alpine swift, clocking thousands of miles at a time. Glide into the astounding world of avian sleep.

The Secret World of Animal Sleep: Asleep on the Wing (3:01)

Gasp! The answer will amaze you.

Ask Smithsonian: How Long Can a Person Hold Their Breath? (1:32)

The science of earwax in under a minute

Ask Smithsonian: What's the Point of Earwax? (1:05)

Mans best friend is also one of his oldest.

Ask Smithsonian: When Did People Start Keeping Pets? (1:05)

Lil Nas X explains the origins of his diamond-certified crossover hit, ‘Old Town Road.' Video by Adam Grossman | Good Dog Media

Smithsonian American Ingenuity Awards 2019: Lil Nas X (3:04)

Medical researchers Ewelina Mamcarz and Stephen Gottschalk detail the science behind the gene therapy they invented to help children with “bubble boy disease,” or severe combined immunodeficiency. Video by Adam Grossman | Good Dog Media

Smithsonian American Ingenuity Awards 2019: Ewelina Mamcarz and Stephen Gottschalk (3:32)

“In our world, nothing really is impossible. Everything at best is improbable,” says Alex Kipman, as he discusses the holographic, augmented reality technology his team at Microsoft is pioneering. Video by Adam Grossman | Good Dog Media

Smithsonian American Ingenuity Awards 2019: Alex Kipman (2:45)

Climb into the guts of a hovercraft, as a team of salvage experts, led by a former NASA engineer, disassemble and cut through this iconic and unique vehicle.

Take a Look Inside One of the Most Unusual Vehicles Ever (2:43)

Marc Goodman has spent a career in law enforcement and technology. He has served as a street police officer, senior adviser to Interpol and futurist-in-residence with the FBI. As the founder of the Future Crimes Institute and the Chair for Policy, Law, and Ethics at Silicon Valleys Singularity University, he continues to investigate the intriguing and often terrifying intersection of science and security, uncovering nascent threats and combating the darker sides of technology

DO NOT PUBLISH Future Is Here Festival 2015: Marc Goodman, Chair for Policy and Law at Singularity University (17:19)

Greg Henderson is the founder, CEO and chief visionary for Arx Pax. Greg began his career in the military as an Airborne Ranger, serving with the 101st Airborne and 7th Infantry. He graduated from West Point with a B.S in Engineering, and received a Master of Architecture degree from Berkeley. That said, what Greg succinctly envisioned with Arx Pax was a new way to employ an unexploited technology in applications that others did not see. He labeled this epiphany: Magnetic Field Architecture (MFA). Its a big dream on a one-of-a-kind technology that will change the way the world works, plays, builds and lives. All of us here at Arx Pax (and HENDO) passionately believe in its possibility, its potentialand its promise. Which is why the team Greg and Jill have assembled at Arx Pax matters so much

DO NOT PUBLISH Future Is Here Festival 2015: Greg Henderson, Hendo Hoverboard Co-Founder (11:03)