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[Cliff Parker ]
> I am looking for good questions
Here's a simple one:
Suppose you are sitting on the bottom of an ordinary swimming pool, several
feet below the surface. You have an ordinary hose that leads to open air at
the surface. You breathe in through the hose, and breathe out bubbles (to
ensure that the hose doesn't fill up with exhaled air).
This scheme is not widely used. Why not?