"interactive LISP -- a metainvention, the Maxwell's Equations of programming. Today is the 40th aniversary of the first interactive implementation by a 16-year-old Peter Deutsch. It was the first time a programming language became an operating system."
WOW! Really, that's all I can say. Peter does correct the above quote. But, I'll leave that to you to discover. Makes me wish I would have asked more questions when I met Peter at Camp Smalltalk. Darn it!