Trac­ing the spread of a virus over 30 mil­lion years, 28 species, and 5 con­ti­nents
by Zachary Williams — When doc­tors in the 1980s no­ticed that peo­ple were dy­ing from se­vere im­mune de­fi­ciency, no­body had ever seen any­thing like it be­fore; it was a com­pletely novel and ter­ri­fy­ing dis­ease. Once we fig­ured out it was caused by a virus,...