Nitrox in Nature
Sometime in the geologic past the Earth's atmosphere contained much more than 20% oxygen: e.g. up to 35% in the Upper Carboniferous. This let animals absorb oxygen more easily and influenced evolution.
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“A field of water betrays the spirit that is in the air. It is continually receiving new life and motion from above. It is intermediate in its nature between land and sky.”
—Henry David Thoreau (1817–1862)
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