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Phil Plait: How to Defend Earth From Asteroids

What's six miles wide and can end civilization in an instant? An asteroid - and there are lots of them out there. With humor and great visuals, Phil Plait enthralls the TEDxBoulder audience with all the ways asteroids can kill, and what we must do to avoid them.


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Underwater Astonishments

David Gallo shows jaw-dropping footage of amazing sea creatures, including a color-shifting cuttlefish, a perfectly camouflaged octopus, and a Times Square's worth of neon light displays from fish who live in the blackest depths of the ocean.

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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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Tempest Milky Way

Timelapse video that won best overall and audience choice at 2011 Chronos Film Festival.

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Marina Marchese - Beekeeper

There are many health benefits when it comes to local honey. Honey Sommelier and Beekeeper Marina Marchese from Red Bee Honey in Weston explains how honey is made.

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James Hansen: Why I Must Speak Out About Climate Change

Top climate scientist James Hansen tells the story of his involvement in the science of and debate over global climate change. In doing so he outlines the overwhelming evidence that change is happening and why that makes him deeply worried about the future.

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