Scientists have aimed a high-energy X-ray beam at a fossil specimen of Archaeopteryx, the famed "flying dinosaur" and identified key chemicals in the 150-million-year-old bones, wings and soft tissue that settle definitively that the feather-like impressions in the rock that entombed Archaeopteryx were left by real feathers evolved for flight.
Source:
http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2010/05/11/BAKG1DCC9M.DTL&type=science
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