119 763

A "self-healing" asphalt

Paved roads are nice to look at, but they’re easily damaged and costly to repair. Erik Schlangen demos a new type of porous asphalt made of simple materials with an astonishing feature: When cracked, it can be “healed” by induction heating. (Filmed at TEDxDelft.)
85 099

Brilliant designs to fit more people in every city

How can we fit more people into cities without overcrowding? Kent Larson shows off folding cars, quick-change apartments and other innovations that could make the city of the future work a lot like a small village of the past.
72 995

Why good hackers make good citizens

Hacking is about more than mischief-making or political subversion. As Catherine Bracy describes in this spirited talk, it can be just as much a force for good as it is for evil. She spins through some inspiring civically-minded projects in Honolulu, Oakland and Mexico City and makes a compelling case that we all have what it takes to get involved.
70 085

Design with the blind in mind

What would a city designed for the blind be like? Chris Downey is an architect who went suddenly blind in 2008; he contrasts life in his beloved San Francisco before and after -- and shows how the thoughtful designs that enhance his life now might actually make everyone's life better, sighted or not.
67 560

Don't build your home, grow it!

TED Fellow and urban designer Mitchell Joachim presents his vision for sustainable, organic architecture: eco-friendly abodes grown from plants and -- wait for it -- meat.
64 248

How an old loop of railroads is changing the face of a city

Urban planner Ryan Gravel shares the story of how his hometown of Atlanta, Georgia, rallied to build a massive urban park that will transform an abandoned railroad track into 22 miles of public green space called the Atlanta BeltLine. The places we live aren't inevitable, he says and if we want something different, we need to speak up.
57 858

Stewart Brand proclaims 4 environmental 'heresies'

The man who helped usher in the environmental movement in the 1960s and '70s has been rethinking his positions on cities, nuclear power, genetic modification and geo-engineering. This talk at the US State Department is a foretaste of his major new book, sure to provoke widespread debate.
57 506

Steven Johnson tours the Ghost Map

Author Steven Johnson takes us on a 10-minute tour of The Ghost Map, his book about a cholera outbreak in 1854 London and the impact it had on science, cities and modern society.
51 733

The 4 commandments of cities

Eduardo Paes is the mayor of Rio de Janeiro, a sprawling, complicated, beautiful city of 6.5 million. He shares four big ideas about leading Rio -- and all cities -- into the future, including bold (and do-able) infrastructure upgrades and how to make a city "smarter."
37 407

Take back your city with paint

Make a city beautiful, curb corruption. Edi Rama took this deceptively simple path as mayor of Tirana, Albania, where he instilled pride in his citizens by transforming public spaces with colorful designs. With projects that put the people first, Rama decreased crime -- and showed his citizens they could have faith in their leaders. (Filmed at TEDxThessaloniki.)
32 593

Does race affect votes?

Nate Silver has answers to controversial questions about race in politics: Did Obama's race hurt his votes in some places? Stats and myths collide in this fascinating talk that ends with a remarkable insight on how town planning can promote tolerance.
26 390

Retrofitting suburbia

Ellen Dunham-Jones fires the starting shot for the next 50 years' big sustainable design project: retrofitting suburbia. To come: Dying malls rehabilitated, dead "big box" stores re-inhabited, parking lots transformed into thriving wetlands.
6 789

How to grow a forest in your backyard

Forests don't have to be far-flung nature reserves, isolated from human life. Instead, we can grow them right where we are even in cities. Eco-entrepreneur and TED Fellow Shubhendu Sharma grows ultra-dense, biodiverse mini-forests of native species in urban areas by engineering soil, microbes and biomass to kickstart natural growth processes. Follow along as he
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How Syria's architecture laid the foundation for brutal war

What caused the war in Syria? Oppression, drought and religious differences all played key roles, but Marwa Al-Sabouni suggests another reason: architecture. Speaking to us over the Internet from Homs, where for the last six years she has watched the war tear her city apart, Al-Sabouni suggests that Syria's architecture divided its once tolerant and multicultural
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David Rockwell builds at Ground Zero

In this emotionally charged conversation with journalist Kurt Andersen, designer David Rockwell discusses the process of building a viewing platform at Ground Zero shortly after 9/11.

What a driverless world could look like

What if traffic flowed through our streets as smoothly and efficiently as blood flows through our veins? Transportation geek Wanis Kabbaj thinks we can find inspiration in the genius of our biology to design the transit systems of the future. In this forward-thinking talk, preview exciting concepts like modular, detachable buses, flying taxis and networks of suspended
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