Somewhat unrelated, but - is it just me or do other people notice too, that whenever a major university publishes course materials online, the instructors there are normally very young? It wasn't like that a while ago, e.g. when Coursera started, or it is not like that if you look at older MIT videos.<p>Does it reflect university teachers getting younger? Or younger teachers tend to give more effort to putting everything online? Or did my perception change with age?