1918 flu: Origin remains mystery

FILE - In this 1918 file photo made available by the Library of Congress, volunteer nurses from the American Red Cross tend to influenza patients in the Oakland Municipal Auditorium, used as a temporary hospital. Science has ticked off some major accomplishments over the last century. The world learned about viruses, cured various diseases, made effective vaccines, developed instant communications and created elaborate public-health networks. Yet in many ways, 2020 is looking like 1918, the year the great influenza pandemic raged. (Edward A. "Doc" Rogers/Library of Congress via AP, File)