A Brief History of Computing

&#xA; The Cambrian Explosion (1969-1999) &#xA; In the beginning there was UNIX. &#xA; Historians will correctly point out that there were computers before UNIX (1969). These historians are technically correct, which, as every IT professional knows, is the worst kind of correct. &#xA; Before UNIX lay the Mainframe Era, a mysterious geological period populated by refrigerator-sized computers,…