Chinese scientists used a high resolution X-ray scanner at the European Synchrotron Radiation Facility in France to analyze a 55 million-year-old fossil of a mouse-sized ancient primate named Archicebus. The almost complete skeleton is preserved in slate and is the oldest member of the primate group ever found. "It was very active and agile; and it lived in the trees and fed on insects," said Xijun Ni of the Chinese Academy of Sciences in Beijing.

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