Doug, Although I was puzzled about the context, I loved reading your paper! So it was a happy mistake as far as I'm concerned :-) I found it fascinating to realize the equivalence between processes connected by pipes and lazy lists with function composition. And I'll definitely be adding that two-liner to my repertoire of cool examples that I use when trying to explain the virtues of lazy functional programming to others. The other one that I use is the fairly well-known recursive Fibonacci generation: fibonacci = 1 : 1 : zipWith (+) fibonacci (tail fibonacci). By the way, for your Try It section, you might want to consider using codepad.org http://codepad.org, "an online compiler/interpreter, and a simple collaboration tool. It's a pastebin that executes code for you. You paste your code, and codepad runs it and gives you a short URL you can use to share it." For example, through something written here a few days ago, I came across a fascinating generator of rational approximations to pi written in Haskell, and the author used codepad.org http://codepad.org to show both the code and the results. The code is at http://codepad.org/C2IVTlCC and the explanation is at https://www.quora.com/What-is-the-best-rational-approximation-of-pi-Let-best... Understandably, the implementation of codepad.org http://codepad.org is careful about setting resource limits, so it would be interesting to see how well it handles your shell and C programs, both of which are effectively fork-bombs. —Neil