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Tuesday
Jan152013

A Solar Ballet

A Solar Ballet
Video Credit: NASA/Goddard/SDO AIA Team

Explanation: Sometimes, the Sun itself seems to dance. On just this past New Year's Eve, for example, NASA's Sun-orbiting Solar Dynamic Observatory spacecraft imaged an impressive prominence erupting from the Sun's surface. The dramatic explosion was captured in ultraviolet light in the above time lapse video covering four hours. Of particular interest is the tangled magnetic field that directs a type of solar ballet for the hot plasma as it falls back to the Sun. The scale of the disintegrating prominence is huge -- the entire Earth would easily fit under the flowing curtain of hot gas. A quiescent prominence typically lasts about a month, and may erupt in a Coronal Mass Ejection (CME) expelling hot gas into the Solar System. The energy mechanism that creates a solar prominence is still a topic of research. As the Sun nears Solar Maximum this year, solar activity like eruptive prominences should be common.

Monday
Jan142013

The BBC Exposed

For much of its 80 year existence, the BBC has been criticized by those who believe it to be an insidious mixture of political and cultural power, and now in the wake of the Jimmy Savile scandal, the British public is once again outraged at their national broadcaster. Join us today on The Corbett Report as we examine the history, function, and institutional biases of the BBC, and how the British people are rising up against the Big Brother Corporation.

Monday
Jan142013

Stephen Hawking: Questioning The Universe

In keeping with the theme of TED2008, professor Stephen Hawking asks some Big Questions about our universe -- How did the universe begin? How did life begin? Are we alone? -- and discusses how we might go about answering them.


Monday
Jan142013

What Aristotle And Joshua Bell Can Teach Us About Persuasion

Imagine you are one of the world's greatest violin players, and you decide to conduct an experiment: play inside a subway station and see if anyone stops to appreciate when you are stripped of a concert hall and name recognition. Joshua Bell did this, and Conor Neill channels Aristotle to understand why the context mattered.

View full lesson: http://ed.ted.com/lessons/what-aristotle-and-joshua-bell-can-teach-us-about-p...

Monday
Jan142013

How To Find The True Face Of Leonardo

Mona Lisa is one of the best-known faces on the planet. But would you recognize an image of Leonardo da Vinci? Illustrator Siegfried Woldhek uses some thoughtful image-analysis techniques to find what he believes is the true face of Leonardo.

View full lesson: http://ed.ted.com/lessons/how-to-find-the-true-face-of-leonardo-siegfried-wol...