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"I long ago realized that I could reach far more people by writing something, than by walking down the street with a banner."
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It seems clear that at least part of the breathable mix required for Trinocs can be taken directly from the atmosphere.
This is actually a pretty good idea, since similar products called "oxygen concentrators" are starting to replace oxygen cylinders. They are substantially less dangerous that cylinders of oxygen.
Aliens in sf sometimes require something in addition to the elements of Earth's air. In his classic 1953 novel Childhood's End, for example, Arthur C. Clarke's Overlords sometimes needed more than the atmosphere provides:
Compare to David Brin's oxygen hip flask from his 1990 novel Earth. Comment/Join this discussion ( 0 ) | RSS/XML | Blog This | Additional
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