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Here's an observation which may be of interest to biology-inclined FWers. I
am at a fairly advanced stage of emphysema. For example I'm breathess after
about five yards of walking. Before then if I'm carrying anything. I'm
attached by a long thin tube which delivers oxygen-rich air.from my
nostrils to a machine sitting in another room. Until taking to snuff five
years ago, I was a heavy smoker all my life and am still additcted to
nicotine. When I want a sniff I pull the O2 attachmeent away from my nose
and park it elsewhere. If I'm sleeping or if I'm sitting quietly (reading
an easy book or watching TV) I can exist quite happily without O2 for two
or more hours -- and also forget all about snuff! However, if I turn to
writing an e-mail, I find, after no more than a minute, that I'm going
breathless and feel faint. So I quickly have to re-attach myself to O2.
Although it's well-known that the brain requires something like 20% more O2
than the rest of the body (even while walking) my discovery means that
different sorts of brain activity require different oxygen levels. If this
is trivial comment for any FWers at least you know that my brain is working
when I write to FW! How about yours?
