Knowledge

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EyeWitness to History - history through the eyes of those who lived it

Academic Earth | Online Courses | Academic Video Lectures

Learn how Everything Works!"

Arts & Letters Daily - ideas, criticism, debate

Breathingearth - CO2, birth & death rates by country, simulated real-time

Cafe Scientifique

Science news and science jobs from New Scientist

http://www.openculture.com/freeonlinecourses

350 Free Online Courses from Top Universities

Get free online courses from the world’s leading universities. This collection includes over 700 free courses in the liberal arts and sciences.

Big Think | Blogs, Articles and Videos from the World's Top Thinkers and Leaders