Here is how it works

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def learn_new_stuff(time)
    if time > 30.minutes
        # Step 1: the easiest one
        watch_me_doing_it
        # Step 2: the most important one
        practice_by_yourself
        # Step 3: the joyful one
        got_it ? skill_acquided : ask_for_help
    end
end

That’s it.

After upgrading OS X no longer run mplayerx.
It will not play the video and just hanging at startup. The problem turned out to be nipped in the fontconfig cache.

To fix it just write it in your terminal:

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fc-cache -vf

it will take about 5-10 minutes

Welcome to my small blog! This is my very first post.