Deadly Black Death bug hasn’t changed, but we have

WASHINGTON — Sci­en­tists have cracked the genetic code of the Black Death, one of history’s worst plagues, and found that its mod­ern day bac­te­r­ial descen­dants haven’t changed much over 600 years. Luck­ily, we have. The evo­lu­tion of soci­ety and med­i­cine — and our own bod­ies — has far out­paced the evo­lu­tion of that deadly bac­terium, sci­en­tists said.