Perpetual motion machines - devices that can do work indefinitely without any external energy source - have captured many inventors' imaginations because they could totally transform our relationship with energy. There's just one...

In which John Green teaches you about what westerners call the middle ages and the lives of the aristocracy...in Japan. The Heian period in Japan lasted from 794CE to 1185CE, and it was an interesting time in Japan. Rather than being...

Earlier this week, a team of researchers announced that they’d made a discovery about how we inherit mitochondrial DNA from our parents that could change what we know about not only disease inheritance, but human history as a whole.

Fossils can provide clues to the conditions that ancient species lived in, like what their environments felt like, how deep in the water some species lived, or even how long the Sun was out!

Today, we’re going to take a closer look at borders and the stories they tell. When we look at a map, the shapes we’re seeing can seem so permanent, but a map is just a snapshot of the Earth at a particular time, and by looking a...

In the grand scheme of history, modern reality is a bizarre exception when compared to the worlds of ancient, precolonial and Indigenous civilizations, where myths ruled and gods roamed, says historian Greg Anderson. So why do Westerners...

Learn about the Greek physician and philosopher Galen of Pergamon, whose experiments and discoveries changed medicine. -- In the 16th century, an anatomist named Andreas Vesalius made a shocking discovery: the most famous human anatomy...

Trilobites are famous not just because they were so beautifully functional, or because they happened to preserve so well. They're known the world over because they were everywhere!

A clay cylinder covered in Akkadian cuneiform script, damaged and broken, the Cyrus Cylinder is a powerful symbol of religious tolerance and multi-culturalism. In this enthralling talk Neil MacGregor, Director of the British Museum,...

* Viewer discretion advised. This video includes discussion of mature topics and may be inappropriate for some audiences. From our fear of women's bodies to our sheepishness around the word "nipple," our ideas about sex need an upgrade,...

When radium was first discovered, its luminous green color inspired people to add it into beauty products and jewelry. It wasn't until much later that we realized that radium's harmful effects outweighed its visual benefits....

J.D. Vance grew up in a small, poor city in the Rust Belt of southern Ohio, where he had a front-row seat to many of the social ills plaguing America: a heroin epidemic, failing schools, families torn apart by divorce and sometimes...

Cities designed like families can last for generations. Skeptical? Look to master architect Liu Thai Ker, who transformed Singapore into a modern marvel with his unique approach to sustainable urban design. Liu shares creative wisdom and...

Historian Elizabeth Stordeur Pryor leads a thoughtful and history-backed examination of one of the most divisive words in the English language: the N-word. Drawing from personal experience, she explains how reflecting on our points of...

Temnospondyls were a huge group of amphibians that existed for 210 million years. And calling them 'diverse' would be putting it mildly. Yet in the end, two major threats would push them to extinction: the always-changing climate and the...

Many people like to talk about how important voting is, how it's your civic duty and responsibility as an adult. eric Liu agrees with all that, but he also thinks it's time to bring joy back to the ballot box. The former political...

In the 7th century CE, the prophet Muhammad united the people of the Arabian Peninsula through the formation of Islam. Over the next 30 years, caliphs conquered vast areas beyond Arabia, including their mighty neighbors the Persians and...

Oxygen is crucial for life as we know it, but before it could build up in our atmosphere, earth had to slow down.

Margaret Wertheim leads a project to re-create the creatures of the coral reefs using a crochet technique invented by a mathematician -- celebrating the amazements of the reef, and deep-diving into the hyperbolic geometry underlying...

Honeybees have thrived for 50 million years, each colony 40 to 50,000 individuals coordinated in amazing harmony. So why, seven years ago, did colonies start dying en masse? Marla Spivak reveals four reasons which are interacting with...

After Rome was destroyed, people were wary of attachment to physical beauty. As Christianity gained traction, Romans instead began to focus on the metaphysical beauty of virtue, and art began to follow suit. James Earle discusses how...

For more than 1,000 years, Khmer dancers in Cambodia have been seen as living bridges between heaven and earth. In this graceful dance-talk hybrid, artist Prumsodun Ok -- founder of Cambodia's first all-male and gay-identified dance...

How can we bridge the gap between left and right to have a wiser, more connected political conversation? Journalist Gretchen Carlson and op-ed columnist David Brooks share insights on the tensions at the heart of American politics today...

A net-zero future is possible, but first we need to flip a mental switch to truly understand that we can stop the climate crisis if we try, says Nobel laureate Al Gore. In this inspiring and essential talk, Gore shares examples of...