Like in so many other times in human history, technology in the 20th century was driven by war efforts.During the Second World War, Germans developed advanced cryptography and with their Enigma machines they were able to develop a new type of war that they called the Blitzkrieg strategy. On the other side the allies working at Bletchley Park, England, managed to crack the Enigma code and developed the sophisticated Colossus - the first electronic computer. Scientific discoveries during this period ranged from wireless communications to nuclear fusion and a suite of other technologies that shaped the way we live and interact with each other to the present day and its impact on human lives from public health point of view. 

Keywords: Networking; Packets; Colossus; ARPANET;Public Health; Germany; England.