Long ago, an emperor decided to build a great wall to protect his new empire and ensure his power. He ordered men across China to leave their homes and submit to the grueling labor required for its construction. As years passed and the...

In 1952, polio was everywhere: killing or paralyzing roughly half a million people annually. Yet just 10 years later, paralytic polio cases in the US dropped by 96% and we were on track to get rid of polio for good. But in recent years,...

When an Armenian resistance movement began to form in the 19th century, Sultan Abdul Hamid II took decisive action. He led the Hamidian Massacres— a relentless campaign of violence that killed over 150,000 Armenians. These massacres were...

Born to a sea nymph and a king, and trained by the legendary centaur Chiron, Achilles was a demigod destined for greatness. When Greece declared war on Troy, Achilles knew the war was written into his destiny. With horses born from the...

Wigs date at least as far back as ancient Egypt, where well-regarded hairdressers crafted them into intricate styles. And under certain ancient Roman dynasties, women’s wigs became particularly ornate. Yet it wasn’t until Louis XIII...

In his 2000 bestseller "The Tipping Point," Malcolm Gladwell told the story of why crime fell in New York City in the 1990s. Now, 25 years later, he's back with a confession and a mea culpa: "I was wrong," he says. He shares how his...

What if solving poverty, caring for nature and fostering well-being were the ultimate goals of the economy, instead of growth for its own sake? Environmentalist and economist Gaya Herrington proposes a shift in thinking from "never...

What was your favorite toy when you were a kid? Your answer might reveal more about you than you expect, says toy historian Chris Byrne. From Matchbox cars and Barbie to Rubik's Cube and Squishmallows, he explores how playthings reflect...

Joel Bervell was one of the only Black students in his medical school program. After noticing how misconceptions about race were embedded in health care, he turned to social media to raise awareness about the harmful impact of biases in...

When wildfires rage in California, incarcerated people are often on the front lines fighting the flames. TED Fellow Royal Ramey was one of them. He shares the story of how doing public service in prison inspired him to cofound the...

Parallel Universes - Many Worlds

Want to learn more about the topic in this week's video? Here are some keywords/phrases to get your googling started: - Mass Extinction Event: a significant, global decrease in the diversity of life - "Big 5": The five biggest mass...

A technology to ignore birds on radar ended up being useful to study and conserve them.

In which John Green teaches you WHY World War I started. Or tries to anyway. With this kind of thing, it's kind of hard to assign blame to any one of the nations involved. Did the fault lie with Austria-Hungary? Germany? Russia? Julius...

Do We Expand With The Universe

At the end of World War II, the nations of Europe were a shambles. Today we'll learn about how the various countries and blocs approached the problem of rebuilding their infrastructure and helping their residents recover. You'll learn...

Following an assassination attempt on Donald Trump at a campaign rally, president and founder of Eurasia Group and GZERO Media Ian Bremmer joins TED’s Helen Walters to discuss the broader implications for American politics. They...

What if AI could bring the past to life? Cartoonist Amy Kurzweil shares how she helped train an AI chatbot on her late grandfather’s archives, allowing her to connect with a family member she never met — and discover family history she...

Leadership isn’t a title; it’s a verb that requires action, says youth empowerment advocate Mohan Sivaloganathan. Drawing on his experience as the CEO of a nonprofit, he shares surprising lessons on adaptability and accountability,...

Spelling reformers have been advocating for changes to make English spelling more intuitive and less irregular. One example of its messiness: take the “g-h” sound from “enough,” the “o” sound from “women” and the “t-i” sound from...

A group of strangers have gathered to design a just society. To ensure none of them rig the system, they’ve been placed under a veil of ignorance. Under this veil, they’re blind to information about age, sex, profession, wealth,...

In May of 1945 the Third Reich was in chaos. Adolf Hitler was dead and German surrender was imminent. But while World War II was almost over, a new war was brewing. And the US was eager to recruit the smartest minds in Germany before the...

A mathematician with a knife and ball begins slicing and distributing the ball into an infinite number of boxes. She then recombines the parts into five precise sections. Moving and rotating these sections around, she recombines them to...

Corruption is often defined as misuse of a position of power for personal gain. And while corruption in politics is nothing new, it isn't limited to the political sphere; it can happen in schools, sports, businesses, or religious...