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Publisher's Summary

In this issue:
"The Moon That Would Be a Planet": Saturn's largest moon has an atmosphere that's thicker than Earth's and a surface that is almost as varied.
"The Brain's Dark Energy": Recent discoveries in brain activity that may hold a key to understanding neurological disorders and even consciousness itself.
"Fusion's False Dawn": Scientists have long dreamt of harnessing nuclear fusion – for of a safe, clean and virtually unlimited energy supply.
"Toxic Gas, Lifesaver": New findings reveal how a lethal gas actually plays a key role in the survival of the human body.
©2010 Scientific American
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