Resumen de 50,100 & 150 Years Ago.

• Excerpts of articles published in "Scientific American" 50, 100, and 150 years ago are presented including a report on Soviet archaeologists' discovery of the remains of a people, called Scythians, in central Siberia, Russia in the May 1965 issue, a report on the sinking of the Lusitania ship in the May 1915 issue, and a report on the invention of the Gatling gun in the May 1865 issue.