Why do we need to breathe?
Well, why?
Why do we need Oxygen?
Most of the effort that we output seems to be fuelled by chemical energy extracted from our food.
The amount of energy we extract from a breath of air must be quite small, yet- if you don't breathe for 2 or 3 minutes, you snuff it.
Why, when we can get so much energy out of our grub, are we still so dependent on air?
-started thinking about this sort of thing as ones mother has a collapsed lung at the moment...
Last edited by AtomKraft; 16th Sep 2013 at 18:17.