Resumen de 50, 100 & 150 Years Ago.

• The article presents scientific events that occurred 50, 100 and 150 years ago. In July of 1956, an article explained the work of scientists at Stanford University, who in 1951 began to think about a new way of examining the nuclei of atoms. Another article reports on the high-energy physics conference in Moscow, then still under communist rule. In July 1906, and article discussed two pleasure galleys that belonged to the emperors Tiberius and Caligula and were found in the waters of Lake Nemi. In 1986, the magazine reported on the safety of railroads in Prussia.