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Geoffrey West: The Surprising Math of Cities and Corporations

Physicist Geoffrey West has found that simple, mathematical laws govern the properties of cities -- that wealth, crime rate, walking speed and many other aspects of a city can be deduced from a single number: the city's population. In this mind-bending talk from TEDGlobal he shows how it works and how similar laws hold for organisms and corporations.

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The Skin Gun

A simple idea backed by stem cell research allows victims of severe burns to heal in merely days.

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The True Cost of Oil: Garth Lenz

What does environmental devastation actually look like? At TEDxVictoria, photographer Garth Lenz shares shocking photos of the Alberta Tar Sands mining project -- and the beautiful (and vital) ecosystems under threat.

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Candy Chang: Before I Die I Want To...

In her New Orleans neighborhood, artist Candy Chang turned an abandoned house into a giant chalkboard asking a fill-in-the-blank question: Before I die I want to ___.

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Defying Gravity

What happens in our brain when we view an optical illusion? The information gathered by the eye is processed in the brain to create an idea or image that does not match with a physical measurement of the stimulus source.

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