XPost: alt.fan.heinlein   
   From: dannyb@panix.com   
      
   No doubt I'll remember this 30 seconds after posting, but   
   so far my brain is drawing a blank.   
      
   They're all on a spaceship with Heinlein's main character   
   in charge.  Two of the passengers are first cousins (or   
   maybe even brother/sister) and... have the hots for each other.   
      
   Heinlein's character is initially disapproving, but then   
   works out the actual math (at least as he figures it) and   
   regards to inbreeding of genetic issues, determines it's   
   pretty small, and has them go for it.   
      
   Any recollections?  Thanks   
      
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   Knowledge may be power, but communications is the key   
    		     dannyb@panix.com   
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