Mauricio Marin felt his heart tighten when the power flicked off at his Richmond, Texas, home on the evening of Feb. 14, shutting down his plug-in breathing machine. Gasping, he rushed to connect himself to one of the portable oxygen tanks his doctors had sent home with him weeks earlier to help his lungs recover after his three-week stay in a COVID-19 intensive care unit.
Between the two portable tanks, he calculated, he had six hours of air.
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