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by Craig Freudenrich, Ph.D.

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Freudenrich, Ph.D., Craig.  "How Aliens Work"  15 May 2001.  HowStuffWorks.com. <http://science.howstuffworks.com/space/aliens-ufos/alien-physiology.htm>  09 February 2012.
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  2. Greetings, Carbon-based Bipeds!
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  3. Speculation: What Might Aliens Be Like?
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