MacArthur winner Sendhil Mullainathan uses the lens of behavioral economics to study a tricky set of social problems -- those we know how to solve, but don't. We know how to reduce child deaths due to diarrhea, how to prevent diabetes-related blindness and how to implement solar-cell technology ... yet somehow, we don't or can't. Why?

Two thirds of the population believes a myth that has been propagated for over a century: that we use only 10% of our brains. Hardly! Our neuron-dense brains have evolved to use the least amount of energy while carrying the most information possible -- a feat that requires the entire brain. Richard E. Cytowic debunks this neurological myth (and ...

Philanthropist and Microsoft cofounder Bill Gates offers insights into the COVID-19 pandemic, discussing why testing and self-isolation are essential, which medical advancements show promise and what it will take for the world to endure this crisis. (This virtual conversation is part of the TED Connects series, hosted by head of TED Chris Anders...

Medical animator David Bolinsky presents 3 minutes of stunning animation that show the bustling life inside a cell.

Moshe Szyf is a pioneer in the field of epigenetics, the study of how living things reprogram their genome in response to social factors like stress and lack of food. His research suggests that biochemical signals passed from mothers to offspring tell the child what kind of world they're going to live in, changing the expression of genes. "DNA i...

When game designer Jane McGonigal found herself bedridden and suicidal following a severe concussion, she had a fascinating idea for how to get better. She dove into the scientific research and created the healing game, SuperBetter. In this moving talk, McGonigal explains how a game can boost resilience -- and promises to add 7.5 minutes to your...

A pioneer in research on play, Dr. Stuart Brown says humor, games, roughhousing, flirtation and fantasy are more than just fun. Plenty of play in childhood makes for happy, smart adults -- and keeping it up can make us smarter at any age.

Did you know that almost 150 million people worldwide are born intersex -- with biology that doesn't fit the standard definition of male or female? (That's as many as the population of Russia.) At age 10, Emily Quinn found out she was intersex, and in this wise, funny talk, she shares eye-opening lessons from a life spent navigating society's th...

Tod Machover of MIT's Media Lab is devoted to extending musical expression to everyone, from virtuosos to amateurs, and in the most diverse forms, from opera to video games. He and composer Dan Ellsey shed light on what's next.

The world-changing promise of synthetic biology and gene editing has a dark side. In this far-seeing talk, author and entrepreneur Rob Reid reviews the risks of a world where more and more people have access to the tools and tech needed to create a doomsday bug that could wipe out humanity -- and suggests that it's time to take this danger serio...

How much do you know about intellectual disabilities? Special Olympics champion and ambassador Matthew Williams is proof that athletic competition and the camaraderie it fosters can transform lives, both on and off the field. Together with his fellow athletes, he invites you to join him at the next meet -- and challenges you to walk away with yo...

Diane Wolk-Rogers teaches history at Marjory Stoneman Douglas High School in Parkland, Florida, site of a horrific school shooting on Valentine's Day 2018. How can we end this senseless violence? In a stirring talk, Wolk-Rogers offers three ways Americans can move forward to create more safety and responsibility around guns -- and invites people...

How does psychological trauma affect children's developing brains? In this powerful talk, social worker Luis H. Zayas discusses his work with refugees and asylum-seeking families at the US-Mexico border. What emerges is a stunning analysis of the long-term impact of the US's controversial detention and child separation policies -- and practical ...

On July 20, 2012, a mass shooting in a movie theater of Aurora, Colorado left the town, and its nation, reeling. To many -- including Tom Teves, who lost his son in the tragedy -- the news coverage that followed focused on all the wrong things. Why did the reporting overwhelmingly fixate on the shooter rather than the lives of the victims or the...

Why do we jail people for being poor? Today, half a million Americans are in jail only because they can't afford to post bail, and still more are locked up because they can't pay their debt to the court, sometimes for things as minor as unpaid parking tickets. Salil Dudani shares stories from individuals who have experienced debtors' prison in F...

We all want to be safe, and our safety is intertwined, says Tracie Keesee, cofounder of the Center for Policing Equity. Sharing lessons she's learned from 25 years as a police officer, Keesee reflects on the public safety challenges faced by both the police and local neighborhoods, especially in the African American community, as well as the opp...

Being open and vulnerable with your loneliness, sadness and fear can help you find comfort and feel less alone, says writer and artist Jonny Sun. In an honest talk filled with his signature illustrations, Sun shares how telling stories about feeling like an outsider helped him tap into an unexpected community and find a tiny sliver of light in t...

Everybody knows that most women go a little crazy right before they get their period, that their reproductive hormones cause their emotions to fluctuate wildly. Except: There's very little scientific consensus about premenstrual syndrome. Says psychologist Robyn Stein DeLuca, science doesn't agree on the definition, cause, treatment or even exis...

Nalini Nadkarni challenges our perspective on trees and prisons -- she says both can be more dynamic than we think. Through a partnership with the state of Washington, she brings science classes and conservation programs to inmates, with unexpected results.

When Richard J. Berry, the mayor of Albuquerque, saw a man on a street corner holding a cardboard sign that read "Want a job," he decided to take him (and others in his situation) up on it. He and his staff started a citywide initiative to help the homeless by giving them day jobs and a place to sleep -- and the results were incredible. Find out...

In halls of justice around the world, how can we ensure everyone is treated with dignity and respect? A pioneering judge in New Jersey, Victoria Pratt shares her principles of "procedural justice" -- four simple, thoughtful steps that redefined the everyday business of her courtroom in Newark, changing lives along the way. "When the court behave...

We all love to tell personal stories of adversity and triumph, but how do they prepare us to navigate an unpredictable future? Entrepreneur Andrew Peek believes that our life stories limit us. "Are we wrapped in the warmth of the story we've been writing for decades? The further we are into a story, the less likely we are to want to rewrite it."...

In this captivating talk from the TED archive, cartoonist Ben Katchor reads from his comic strips. These perceptive, surreal stories find the profound hopes and foibles of history (and modern New York) preserved in objects like light switches and signs.

(NOTE: Adam Foss is currently under investigation by the Suffolk County District Attorney's office. For more details and TED's response, read "An update on allegations about a TED speaker" below.) When a kid commits a crime, the US justice system has a choice: prosecute to the full extent of the law, or take a step back and ask if saddling young...

Lindsay Amer is the creator of "Queer Kid Stuff," an educational video series that breaks down complex ideas around gender and sexuality through songs and metaphors. By giving kids and their families a vocabulary to express themselves, Amer is helping to create more empathetic adults -- and spreading a message of radical acceptance in a world wh...

When Robert Gupta was caught between a career as a doctor and as a violinist, he realized his place was in the middle, with a bow in his hand and a sense of social justice in his heart. He tells a moving story of society's marginalized and the power of music therapy, which can succeed where conventional medicine fails.

What happens when technology knows more about us than we do? Poppy Crum studies how we express emotions -- and she suggests the end of the poker face is near, as new tech makes it easy to see the signals that give away how we're feeling. In a talk and demo, she shows how "empathetic technology" can read physical signals like body temperature and...

Designer Tea Uglow is creating a future in which humanity's love for natural solutions and simple tools can coexist with our need for information and the devices that provide us with it. "Reality is richer than screens," she says. "We can have a happy place filled with the information we love that feels as natural as switching on lightbulb."

In this deeply personal talk, photographer Ryan Pfluger shares how difficult times prompted him to take a series of road trips during which he discovered the power of photography to foster connection. Describing the tradition's unique place in our image-saturated culture, he explains how portrait photography -- even if its just self-portraiture ...

When we define racism as behaviors instead of feelings, we can measure it -- and transform it from an impossible problem into a solvable one, says justice scientist Dr. Phillip Atiba Goff. In an actionable talk, he shares his work at the Center for Policing Equity, an organization that helps police departments diagnose and track racial gaps in p...