In today’s wired world, people will start experimenting with an interesting new programming language shortly after it appears on a hosting service. But things took longer in the early days of Lisp. McCarthy’s famous paper on Lisp was presented at a conference in May 1959 and published in CACM in April 1960, by which time a system with an interpreter and compiler was running on MIT’s IBM 704; the paper notes “A programmer’s manual is being prepared.” Gradually copies of Lisp were requested by other IBM installations (the system was ported to the 709 and then the 7090). Modifications were often required to adapt it to a particular hardware configuration or operating environment and it was several years before Lisp was adapted to other kinds of computers. Without the internet or “social networking”, the propagation of ideas depended even more heavily on people. The physicist Harold V. McIntosh was one of the first to spread Lisp beyond MIT.