"Efficiency, security — they are important and they make a city accessible," says computer scientist Daniele Quercia, "but they don't make a city great." So, what does?

"Efficiency, security — they are important and they make a city accessible," says computer scientist Daniele Quercia, "but they don't make a city great." So, what does? iStock hide caption

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"Efficiency, security — they are important and they make a city accessible," says computer scientist Daniele Quercia, "but they don't make a city great." So, what does?

"Efficiency, security — they are important and they make a city accessible," says computer scientist Daniele Quercia, "but they don't make a city great." So, what does?

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Building Better Cities

Cities are among our greatest experiments in human co-habitation. Do they also hold the answers to some of our biggest problems? This hour, TED speakers explore how cities can change the world.

"Einstein once said, 'Logic will get you from A to B. Imagination will take you everywhere.' " — Daniele Quercia Wolfram Scheible/TED hide caption

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Can Changing Your Route Change Your Experience Of A City?

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"The city, the township, is a natural expression, a natural manifestation of that social instinct that we have. ... They define us." — Benjamin Barber James Duncan Davidson/TED hide caption

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Does The Road To Changing The World Go Through City Hall?

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Detroit, Lift Up Your Weary Head! (Rebuild! Restore! Reconsider!) Sufjan Stevens
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"Cities are where you can see your mayor in a grocery store." — Kasim Reed Courtesy of TEDCity2.0 hide caption

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How Are Mayors Better Poised to 'Get Things Done'?

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"Fragile cities ... will define the future of order and disorder." — Robert Muggah James Duncan Davidson/TED hide caption

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How Are Some Fragile Cities Tackling Their Worst Problems?

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Agua de Beber Antonio Carlos Jobim

"Cities are meant to be for people. They are meant as places for people to come together." — Amanda Burden James Duncan Davidson/TED hide caption

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How Can Public Spaces Change A City's Character?

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Cities Talking Heads