Carl Sagan explains the 4th dimension.
Elizabeth Warren, Harvard law professor, manages to show the connection between all the important issues that affect the American middle class.
Found at The Big Picture (via Reddit).
At TEDIndia, Pranav Mistry shows how he brought the virtual world into the real world.
Brian Malow aims for smaller audiences: Comedy for Scientists.
Hans Rosling, the "statistics broadcaster", gave another great talk at TEDIndia. In it, he predicts that Asian countries soon will catch up with Western countries.
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