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5:09
China is ramping up production of solar technology but coal power remains king.
2:58
Saul Griffith has put himself on a strict regime to reduce their carbon footprint.
1:48
Developer Larry Silverstein explains what's different about the new 7 World Trade Center.
2:20
Visitors to the newly opened 9/11 memorial share their impressions.
5:15
Take a behind-the-scenes look at this animated scene from "The Fabric of the Cosmos."
4:06
Learn how to find signs of extraterrestrial life in our galaxy without leaving home.
1:18
What do you get when you introduce a chunk of Sodium to a Bunsen burner? Sizzling romance.
3:21
See how salamanders in California are evolving, just as Darwin might have predicted.
2:42
Hotels are offering an innovative way for observant Jews to use elevators on the Sabbath.
4:05
See neuroscientist Oliver Sacks's brain respond differently to music by Bach & Beethoven.
