Kakenya Ntaiya made a deal with her father: She would undergo a traditional Maasai rite of passage, female circumcision, if he would let her go to high school. Ntaiya tells the fearless story of continuing on to college, and of working with her village elders to build a school for girls in her community, changing the destiny of 125 young women.

The world is becoming increasingly open, and that has implications both bright and dangerous. Marc Goodman paints a portrait of a grave future, in which technology's rapid development could allow crime to take a turn for the worse.

Speaking as both an astronomer and "a concerned member of the human race," Sir Martin Rees examines our planet and its future from a cosmic perspective. He urges action to prevent dark consequences from our scientific and technological development.

Painter Alyssa Monks finds beauty and inspiration in the unknown, the unpredictable and even the awful. In a poetic, intimate talk, she describes the interaction of life, paint and canvas through her development as an artist, and as a human.

After a crisis, how can we tell if water is safe to drink? Current tests are slow and complex, and the delay can be deadly, as in the cholera outbreak after Haiti's earthquake in 2010. TED Fellow Sonaar Luthra previews his design for a simple tool that quickly tests water for safety -- the Water Canary.

Educating the poor is more than just a numbers game, says Shukla Bose. She tells the story of her groundbreaking Parikrma Humanity Foundation, which brings hope to India's slums by looking past the daunting statistics and focusing on treating each child as an individual.

At the BIF innovation summit, Cat Laine draws on the Greek myth of Tantalus to explain the frustration developing countries face. She shows how we might help communities rich in human capital, but poor in resources and infrastructure, with cleverly engineered solutions.

Education scientist Sugata Mitra tackles one of the greatest problems of education -- the best teachers and schools don't exist where they're needed most. In a series of real-life experiments from New Delhi to South Africa to Italy, he gave kids self-supervised access to the web and saw results that could revolutionize how we think about teaching.

Hans Rosling reframes 10 years of UN data with his spectacular visuals, lighting up an astonishing -- and under-reported -- piece of front-page good news: We're winning the war against child death. Along the way, he debunks one flawed approach to stats that blots out such vital stories.

If you had to walk a mile for a jug of water every day, as millions of people do, it's unlikely you'd use that precious water to bathe. Young entrepreneur Ludwick Marishane tells the amazing, funny story of how he invented a cheap, clean and convenient solution: DryBath, the world's first bath-substituting lotion.

In this deeply personal talk, Jenna Weiner draws from her experiences as a transgender woman and college athlete to advocate for greater gender inclusivity in sports, a development that would benefit both athletes and the culture around them.

TED Studies, created in collaboration with Wiley, are curated video collections — supplemented by rich educational materials — for students, educators and self-guided learners. In Ecofying Cities, speakers reveal ideas about sustainable development (and redevelopment) that aren't all about setting limits, going without or preparing for the worst...

"We are living in a world that is tantalizingly close to ensuring that no one need die of hunger or malaria or diarrhea," says economist Michael Green. To help spur progress, back in 2015 the United Nations drew up a set of 17 goals around important factors like health, education and equality. In this data-packed talk, Green shares his analysis ...

Tristan Harris helps the technology industry more consciously and ethically shape the human spirit and human potential.

Aspirations are rising as never before across the world, thanks in large part to smartphones and the internet -- will they be met with opportunity or frustration? Former President of the World Bank Group Jim Yong Kim shares how the institution is working to improve the health and financial futures of people in the poorest countries by boosting i...

Strap video cameras to their foreheads! To better understand child development, Richard Neville decided to see the world from a child's point of view. What did he observe? Children want to learn, and we might just be getting in their way...

Alleviating poverty is more guesswork than science, and lack of data on aid's impact raises questions about how to provide it. But Clark Medal-winner Esther Duflo says it's possible to know which development efforts help and which hurt -- by testing solutions with randomized trials.

Archaeologists routinely vet terrestrial construction and development projects to make sure they don't accidentally damage historical sites. Why not do the same for the moon? In this cautionary talk, space archaeologist Alice Gorman highlights the moon's prominent role in our culture and the importance of thoughtfully preserving it.

How do you teach an entire country how to vote when no one has done it before? It's a huge challenge facing fledgling democracies around the world -- and one of the biggest problems turns out to be a lack of shared language. After all, if you can't describe something, you probably can't understand it. In this eye-opening talk, election expert Ph...

What if you could track donations of medicines that help treat over one billion of the world's poorest people against neglected tropical diseases, the same way you track the package you order on Amazon? Working with supply chain experts from around the world, biochemist Christian Schröter developed a method for tracking medical donations from th...

Drawing on her research into early childhood development, psychologist Sara Valencia Botto investigates when (and how) children begin to change their behaviors in the presence of others -- and explores what it means for the values we communicate in daily interactions. (Watch for cute footage of sneaky toddlers.)

Christiana Figueres is an internationally recognized leader on climate action and steered the global diplomatic effort that culminated in the 2015 Paris Agreement.

Today, we relate the human microbiome to what it can tell us about our own current health. In this fascinating talk, microbiologist Alisa Kazarina describes how cutting edge research at the crossroads of archaeology and microbiology can trace humanity's physical development while providing insight on how to treat contemporary diseases.

Philosopher Dan Dennett calls for religion -- all religion -- to be taught in schools, so we can understand its nature as a natural phenomenon. Then he takes on The Purpose-Driven Life, disputing its claim that, to be moral, one must deny evolution.

Haley Van Dyck is building a startup at the White House and recruiting world-class technology talent to change how government works for the American people.

In this provocative talk, journalist Andrew Mwenda asks us to reframe the "African question" -- to look beyond the media's stories of poverty, civil war and helplessness and see the opportunities for creating wealth and happiness throughout the continent.

The growth of online marketplaces like Uber, Airbnb and Amazon can sometimes threaten local businesses such as taxis, hotels and retail shops by taking away jobs or reducing income to the community. But it doesn't have to be this way, says strategy consultant Amane Dannouni. Pointing to examples like Gojek (Indonesia's Uber for motorbikes) and J...

Melinda Gates makes a provocative case: What can nonprofits learn from mega-corporations like Coca-Cola, whose global network of marketers and distributors ensures that every remote village wants -- and can get -- an ice-cold Coke? Maybe this model could work for distributing health care, vaccinations, sanitation, even condoms ...

Approximately 700 million people worldwide currently live in extreme poverty, a state of severe financial and social vulnerability that robs many of hope and dignity. BRAC, the world's largest NGO, began a sustainable, multifaceted intervention called the Graduation approach in 2002. Since then, it has helped over nine million people escape extr...

Employee diversity and inclusive leadership are goals for most organizations today, but how do we get there? Try a "reverse mentorship" program, which sets up junior team members to guide senior staff. Here are 6 tips to make reverse mentorship work, from executive coach and personal development advocate Patrice Gordon.