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Old 03-03-2014, 03:29 PM   #2 (permalink)
gone-ot walking...
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It's ironic you bring this up, because I recall reading a science-fiction story--many, many, years ago--about a planet where oxygen was "fuel" for spacecraft (and crew) because the planet's atmosphere was 'azine' (ammonia: NH3).

Last edited by gone-ot; 03-03-2014 at 04:07 PM..
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