Listening To Words: Free Lectures on the Web

I discovered a fairly new site called listeningtowords that provides a collection of links to free online lectures and courses.  Here’s a sample of some of the more popular lectures:
 The Singularity: Your Future as a Black Hole
 Power & Responsibility: Science, Humanity and Religion in the 21st century
 Linked: Networks from Biology to the World Wide Web
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