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LETTERS.
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- Additional Information
- Abstract:
Several letters to the editor are presented in response to previously published articles including one on head transplants, a report by Hal Hodson on plans by internet company Google Inc. to rank websites according to their trustworthiness, and one on the existence of a black hole with a mass 12 billion times that of the sun 12.8 billion years ago, all in the February 28, 2015 issue.
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