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Image: Rihanna In Concert In Montpellier
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Sorry, Bieber! Rihanna is the most viewed artist on YouTube

Bad news for the Biebs! On Tuesday, Rihanna passed the teenage heartthrob as the most viewed artist on YouTube. Full story

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David Drummond, senior vice president of Google, attends the eG8 forum in Paris
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University of Georgia

Plant parts used to generate electricity

Researchers have built an energy conversion technology inspired by photosynthesis, the process plants use to convert sunlight into food. It may one day power remote sensors. Full story

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Image: A solar-powered airplane flies from San Francisco Bay
Reuters
Image: A woman walks on a street with her umbrella as an atmospheric phenomenon known as a "sun dog" is seen in the sky over Havana
Reuters
Image: NASA handout shows NASA Expedition 35 Flight Engineers Cassidy and Marshburn conducting a spacewalk to inspect and replace a pump controller box on the International Space Station's far port truss
Reuters
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AP
Zachary Grether
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AFP - Getty Images
Image: Musical performance at space station
EPA
Mingzhai Sun and Joshua Shaevitz (Princeton) / Filiz Bunyak and Kannappan Palaniappan (Univ. of Missouri-Columbia)
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Image: A giant sinkhole in Guatemala City, Guatemala.
AP
Arian Schuessler / Mason City Globe Gazette

Science

Space

Top headlines

What's up in space
from NBC News Digital

We've moved our coverage of space science and exploration to a new home page on the Web. Explore the universe at http://science.nbcnews.com/space

Multimedia
Image: NASA handout shows NASA Expedition 35 Flight Engineers Cassidy and Marshburn conducting a spacewalk to inspect and replace a pump controller box on the International Space Station's far port truss
Reuters
Zachary Grether

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