Top Scientific Discoveries of 2013

In terms of scientific discoveries, 2012 was a hard act to follow. This year didn't offer anything quite as dramatic as the long-awaited discovery of the Higgs boson or another rover landing safely on Mars, but it still had its share of highlights, from see-through brains, to electronic sensors designed to work inside the body, to puzzling revelations about dark matter. Here are our picks for the top discoveries, advances and other developments that shook up science this year.
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