> I was
> wondering what it would take, in terms of biotech, to enhance someone to
> the point where they could punch through walls.
I once woke up to a hole in the wall above my head, puzzled over it awhile, and finally recalled that the neighbors' noise had prompted me to let fly a few groggy punches at the wall. So I'd say that you already have all the tech you need. Just make sure that you aim *between* the studs!