Michael Tubbs is the youngest mayor in American history to represent a city with more than 100,000 people -- and his policies are sparking national conversations. In this rousing talk, he shares how growing up amid poverty and violence in Stockton, California shaped his bold vision for change and his commitment to govern as a neighbor, not a politician. "When we see someone different from us, they should not reflect our fears, our anxieties, our insecurities," he says. "We should see our common humanity."

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Your teeth carry secrets: centuries of history about your ancestors, from where they lived to what they ate and where they traveled. Bioarchaeologist Carolyn Freiwald traces the story of human migration across the Americas -- from Mayan royalty and Belizean buccaneers to rural Appalachian farmers -- to illustrate what ancient teeth can reveal about you.

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Centuries of inequality can’t be solved with access to technology alone -- we need to connect people with training and support too, says tech inclusionist ’Gbenga Sesan. Sharing the work behind the Paradigm Initiative, a social enterprise in Nigeria that’s empowering young people with digital resources and skills, Sesan details a vision for creating life-changing opportunities for generations of people across Africa.

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Climate change is the epic challenge of our lives, and community leaders like Rahwa Ghirmatzion and Zelalem Adefris are already working on sustainable, resilient solutions. Through their organizations in Buffalo and Miami, they're focused on durable, affordable housing for under-resourced communities, the most vulnerable to the instability of climate change. Watch for a lesson on how we can work alongside our neighbors to address climate catastrophe and social inequality. (Narrated by Don Cheadle)

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What if microparticles could help us solve the world's biggest problems in a matter of minutes? That's the promise -- and magic -- of quantum computers, says Matt Langione. Speaking next to IBM's quantum computer, he explains how these machines solve complex challenges like developing vaccines or calculating financial risk exponentially faster than even the best supercomputers -- and shares why industries should prepare now for this new leap in computing.

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Concrete is the second most-used substance on Earth (behind water), and it's responsible for eight percent of the world's carbon footprint. Cement researcher Karen Scrivener shares the research behind a pioneering new kind of cement known as LC3, which could slash carbon emissions from this crucial building material by 40 percent, if adopted at scale.

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How do you get the environment to the top of everyone's priority list? You can't, says climate advocate Angela Francis -- but you can get them to care about improving their lives. In this pragmatic talk, she shares her playbook for helping even the most skeptical among us see the benefits of a greener economy on their health, wealth and well-being.

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What drives society’s understanding of right and wrong? In this thought-provoking talk, futurist Juan Enriquez offers a historical outlook on what humanity once deemed acceptable -- from human sacrifice and public executions to slavery and eating meat -- and makes a surprising case that exponential advances in technology leads to more ethical behavior.

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Here's a shocking statistic: 50 to 80 percent of people in the criminal justice system in the US have had a traumatic brain injury. In the general public, that number is less than five percent. Neuropsychologist Kim Gorgens shares her research into the connection between brain trauma and the behaviors that keep people in the revolving door of criminal justice -- and some ways to make the system more effective and safer for everyone.

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What if we could better understand the world's biggest challenges simply by looking at a map? Jack Dangermond, a pioneer in geographic information system (GIS) technology that powers the digital maps people around the world use every day, speaks with TED technology curator Simone Ross about how his team is building a geospatial nervous system: a global, interconnected GIS network that reveals patterns, visualizes trends -- and could transform the way we make decisions about nearly everything.

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