Interesting article. I'd never heard of this concept before and thought "That sounds trivial" until I started to read the article. I must admit though, I gave u

Interesting article. I'd never heard of this concept before and thought "That sounds trivial" until I started to read the article. I must admit though, I gave up halfway through when the C code got too esoteric for me to follow. But still feel I've learned something new today. The article title seems a bit off though. When I read 'Self-Replicating Programs' [sic] it I immediately thought "Worms" but the article actually refers to programmes which can print out their own source code listing. Which seems to me to be a different challenge.