It is daunting what the 600 patients and staff members trapped by a moat of filthy water inside Charity Hospital in New Orleans have been doing without. The lights are down, which means that medication must be rushed through sodden hallways by flashlight after dark. The ventilators are down, which meant that, for a while, nurses had to pump the airbags of pulmonary cases by hand.There are few phones. No x-ray machines. No CAT scans. No computers. No air-conditioners. The lab is down, which means that if a patient has an infection, physicians must determine how serious it is by...