The war over private life spreads inexorably. Some seek to expose, invade and steal it, others to protect, conceal and withhold it. Either way, the assumption is that privacy is a possession to be won or lost. But what if what we call private life is the one element in us that we can't possess? Could it be that we're so intent on taking hold of the privacy of others, or keeping hold of our own only because we're powerless to do either? In...