Just coming here to give my usual thank you/plug to Allen B. Downey for all of his wonderfully written (and free!) books. Aside from The Little Book of Semaphor

Just coming here to give my usual thank you/plug to Allen B. Downey for all of his wonderfully written (and free!) books. Aside from The Little Book of Semaphores, here are a few of my favorites: How To Think Like A (Functional) Programmer ("Think OCaml") - http://greenteapress.com/thinkocaml/index.html http://greenteapress.com/thinkocaml/index.html Think Operating Sytems - http://greenteapress.com/thinkos/index.html http://greenteapress.com/thinkos/index.html Think Bayes - http://greenteapress.com/wp/think-bayes/ http://greenteapress.com/wp/think-bayes/ Think Stats - http://greenteapress.com/thinkstats2/index.html http://greenteapress.com/thinkstats2/index.html Also important is his section about how to help free books: http://greenteapress.com/easy.html http://greenteapress.com/easy.html