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Science  12 Apr 2013:
Vol. 340, Issue 6129, pp. 139
DOI: 10.1126/science.340.6129.139-b

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Summary

The Curiosity rover has come across hints of chemical reactions on Mars that could have produced the organic "building blocks of life," but without any life. And big impacts on the moon and Mars have blasted off bits of rock that have been picked up on Earth, so could it be possible that a researcher has found a meteorite from Mercury?