It really helps, I used to learn Markov Chain Theory in graduate school, but either I was not paying attention, or the tutor did not really intended to get things better-explained, I never truely care about its real life application.

But this tutorial, both visually attractive and expained with real life examples, make me want to re-learn this topic. Just quote one passage:

[if you made a Markov chain model of a baby's behavior, you might include "playing," "eating", "sleeping," and "crying" as states, which together with other behaviors could form a 'state space': a list of all possible states.]

Thanks for sharing!