This Prototype for a Robotic Flipper Was Inspired by Sea Lions

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)

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)

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)

The Japanese attack on Pearl Harbor was spearheaded by one of the most dominant fighter planes in the Pacific: the ultra-light, extremely maneuverable Mitsubishi A6M "Zero."

This Japanese Fighter Plane Led the Attack on Pearl Harbor (3:07)

The space suits used by the astronauts on Gemini 7, known as grasshopper suits, were designed for comfort. But after two weeks inside them, that was the last thing on the crew’s minds.

There's a Limit to the Comfort Level of NASA Space Suits (3:32)

In 1942, the Japanese were bearing down on the Philippines, where General Douglas MacArthur was based. To help him escape, the Navy relied on a small but heavily armed class of ships: the PT boat.

How PT Boats Helped General MacArthur Escape Capture (3:39)

Greg Spriggs and Jim Moye are on a mission: to declassify all valuable film footage that exists of every U.S. nuclear test ever conducted.

Bringing Classified Nuclear Test Footage to the Public (1:47)

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)