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On Sat, 3 Feb 1996 steve.cole@genie.com wrote:

> Dan Lipkowitz (Digest 840): The Sauropods (floating through the air on
> their hydrogen-filled bodies) descended to the ground at night when
> the cooling hydrogen could no longer support them, and rose again the
> next morning when the first rays of the sun heated their gas bags.

This might work if they were filled with hot air.  Hydrogen, however, is 
much lighter than air no matter what the temperature.  Of course, hot air 
wouldn't work, either, as it would be heated continuously by the 
sauropod's high metabolism.  :-) 

Nick Pharris
Pacific Lutheran University
Tacoma, WA 98447

"If you can't convince them, confuse them." -- Harry S. Truman